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Dynamic, learner-centered art

Our unique approach to visuals is designed to emphasize only the components most important in any given illustration. The art style is particularly aimed at focusing student learning through a powerful blend of traditional depictions and instructional innovations.

Much of the art in this book consists of black line illustrations. The strongest line is used to highlight the most important structures, and shading is used to show dimension and shape. Color is used sparingly to highlight and clarify the primary anatomical or functional point of the illustration. This technique is intended to draw students’ attention to the critical learning point in the illustration, without distraction from excessive gradients, shadows, and highlights. Full color is used when the structure or process requires it (for example, muscle diagrams and cardiovascular system illustrations).

The pharynx

A color illustration of the pharynx.
By highlighting the most important portions of the illustration, the artwork helps students focus on the most important points, without overwhelming them.


Micrograph magnifications have been calculated based on the objective provided with the image. If a micrograph was recorded at 40×, and the image was magnified an additional 2×, we calculated the final magnification of the micrograph to be 80×.

Please note that, when viewing the textbook electronically, the micrograph magnification provided in the text does not take into account the size and magnification of the screen on your electronic device. There may be some variation.

Sebaceous glands

A color illustration of the pharynx.
These glands secrete oils that lubricate and protect the skin. LM × 400. (Micrograph provided by the Regents of University of Michigan Medical School © 2012)

Learning resources

The following resources are (or will be) available in addition to main text:

  • PowerPoint slides: For each chapter, the illustrations are presented, one per slide, with their respective captions.
  • Pronunciation guide: A subset of the text’s key terms are presented with easy-to-follow phonetic transcriptions. For example, blastocyst is rendered as “blas'to-sist”

About our team

Senior contributing authors

J. Gordon Betts Tyler Junior College
Peter Desaix University of North Carolina at Chapel Hill
Eddie Johnson Central Oregon Community College
Jody E. Johnson Arapahoe Community College
Oksana Korol Aims Community College
Dean Kruse Portland Community College
Brandon Poe Springfield Technical Community College
James A. Wise Hampton University
Mark Womble Youngstown State University
Kelly A. Young California State University, Long Beach


Robin J. Heyden

Contributing authors

Kim Aaronson Aquarius Institute; Triton College
Lopamudra Agarwal Augusta Technical College
Gary Allen Dalhousie University
Robert Allison McLennan Community College
Heather Armbruster Southern Union State Community College
Timothy Ballard University of North Carolina Wilmington
Matthew Barlow Eastern New Mexico University
William Blaker Furman University
Julie Bowers East Tennessee State University
Emily Bradshaw Florida Southern College
Nishi Bryska University of North Carolina, Charlotte
Susan Caley Opsal Illinois Valley Community College
Boyd Campbell Southwest College of Naturopathic Medicine and Health Sciences
Ann Caplea Walsh University
Marnie Chapman University of Alaska, Sitka
Barbara Christie-Pope Cornell College
Kenneth Crane Texarkana College
Maurice Culver Florida State College at Jacksonville
Heather Cushman Tacoma Community College
Noelle Cutter Molloy College
Lynnette Danzl-Tauer Rock Valley College
Jane Davis Aurora University
AnnMarie DelliPizzi Dominican College
Susan Dentel Washtenaw Community College
Pamela Dobbins Shelton State Community College
Patty Dolan Pacific Lutheran University
Sondra Dubowsky McLennan Community College
Peter Dukehart Three Rivers Community College
Ellen DuPré Central College
Elizabeth DuPriest Warner Pacific College
Pam Elf University of Minnesota
Sharon Ellerton Queensborough Community College
Carla Endres Utah State University - College of Eastern Utah: San Juan Campus
Myriam Feldman Lake Washington Institute of Technology; Cascadia Community College
Greg Fitch Avila University
Lynn Gargan Tarant County College
Michael Giangrande Oakland Community College
Chaya Gopalan St. Louis College of Pharmacy
Victor Greco Chattahoochee Technical College
Susanna Heinze Skagit Valley College
Ann Henninger Wartburg College
Dale Horeth Tidewater Community College
Michael Hortsch University of Michigan
Rosemary Hubbard Marymount University
Mark Hubley Prince George's Community College
Branko Jablanovic College of Lake County
Norman Johnson University of Massachusetts Amherst
Mark Jonasson North Arkansas College
Jeff Keyte College of Saint Mary
William Kleinelp Middlesex County College
Leigh Kleinert Grand Rapids Community College
Brenda Leady University of Toledo
John Lepri University of North Carolina, Greensboro
Sarah Leupen University of Maryland, Baltimore County
Lihua Liang Johns Hopkins University
Robert Mallet University of North Texas Health Science Center
Bruce Maring Daytona State College
Elisabeth Martin College of Lake County
Natalie Maxwell Carl Albert State College, Sallisaw
Julie May William Carey University
Debra McLaughlin University of Maryland University College
Nicholas Mitchell St. Bonaventure University
Shobhana Natarajan Brookhaven College
Phillip Nicotera St. Petersburg College
Mary Jane Niles University of San Francisco
Ikemefuna Nwosu Parkland College; Lake Land College
Betsy Ott Tyler Junior College
Ivan Paul John Wood Community College
Aaron Payette College of Southern Nevada
Scott Payne Kentucky Wesleyan College
Cameron Perkins South Georgia College
David Pfeiffer University of Alaska, Anchorage
Thomas Pilat Illinois Central College
Eileen Preston Tarrant County College
Mike Pyle Olivet Nazarene University
Robert Rawding Gannon University
Jason Schreer State University of New York at Potsdam
Laird Sheldahl Mt. Hood Community College
Brian Shmaefsky Lone Star College System
Douglas Sizemore Bevill State Community College
Susan Spencer Mount Hood Community College
Cynthia Standley University of Arizona
Robert Sullivan Marist College
Eric Sun Middle Georgia State College
Tom Swenson Ithaca College
Kathleen Tallman Azusa Pacific University
Rohinton Tarapore University of Pennsylvania
Elizabeth Tattersall Western Nevada College
Mark Thomas University of Northern Colorado
Janis Thompson Lorain County Community College
Rita Thrasher Pensacola State College
David Van Wylen St. Olaf College
Lynn Wandrey Mott Community College
Margaret Weck St. Louis College of Pharmacy
Kathleen Weiss George Fox University
Neil Westergaard Williston State College
David Wortham West Georgia Technical College
Umesh Yadav University of Texas Medical Branch
Tony Yates Oklahoma Baptist University
Justin York Glendale Community College
Cheri Zao North Idaho College
Elena Zoubina Bridgewater State University; Massasoit Community College
Shobhana Natarajan Alcon Laboratories, Inc.

Special thanks

OpenStax wishes to thank the Regents of University of Michigan Medical School for the use of their extensive micrograph collection. Many of the UM micrographs that appear in Anatomy and Physiology are interactive WebScopes, which students can explore by zooming in and out.

We also wish to thank the Open Learning Initiative at Carnegie Mellon University, with whom we shared and exchanged resources during the development of Anatomy and Physiology .

Questions & Answers

define homeostasis and explain it's importants
Adusei Reply
define the important life processes of humans
how the bone marrow transplantation is done?
what is homeostasis
julie Reply
internal temperature of body
Homeostasis is the internal constancy in which your body tries to maintain for optimal cellular functioning. For example, your body tries to maintain an internal body temperature of about 98.6F for optimal functioning of your body.
If a prolonged lost of homeostasis occurs, death of the organism will be the outcome.
Another example of homeostasis is that your body tries to maintain a specific blood sugar level, so that your cells can undergo constant cellular respiration and keep you alive.
homeostasis is the fairly constant internal changes of an environment (your internal environment).The temperature of a body must be kept between the range of 37.5°c
which tissue is more sensitive
Rit Reply
to what?
explain types of hypertension
Juli Reply
What is bulbar paralysis?
Roshni Reply
how can make penis larger
Marwat Reply
what is the stimuli initiates the control of erythropoiesis?
Ok Reply
Erythropoietin, a hormone synthesized and released by the kidneys stimulate erythropoiesis in red bone marrow. When an Individual loses blood (hemorrhage) and the concentration of RBCs or oxygen decreases, erythropoitein will be released.
how lymph is from
Hafsa Reply
Lymph is essentially interstitial fluid that ends up in the lymphatic vessels that didn't go back into the venules. Lymph is composed of the same components as your blood plasma which contains water, solutes, oxygen, CO2, foreign particles such as toxins, bacteria and viruses.
what is the cause of twins
The cause of identical twins is when a single fertilized egg undergo mitosis (splits in two) . As a result, both eggs now have the same genetic information, therefore producing two identical twins.
how structure and function relate to each other?
This is a very important rule in Anatomy and Physiology. The structure of a cell, tissue, or organ will tell you a lot about it's function.
For example, simple columnar cells (enterocytes) in the villus present in the duodenum of the small intestine contain microvilli. Microvilli are finger like projections of the cell membrane (produce by the cytoskeleton)that increase the surface area for absorption of nutrients into the enterocytes.
The main role of these enterocytes is to absorb. Therefore, having Microvilli as a structure relates to its function.
@ Carmelo thanks for the answer.
what is anatomy
Kamran Reply
is simply defined as the stody of internal and external structure of human body and the relationships between the body part.
Anatomy Is The Study Of The Structure Of The Human body
anatomy is the science that deals with the study of the body structure
what is stress hyperglycaemia and Pathophysiology
Hyperglycemia is the term used when somebody is in a state of high blood sugar levels. For example, after you eat a meal with carbohydrates in it, (post-absorbptive state) your blood is hyperglycemic.
Pathophysiology is the study of how diseases function and cause abnormal functioning in the body. Usually pathophysiology is studied at a molecular/cellular level.
I meant to say absorbptive* state on explanation of hyperglycemia. Usually during post-absorbptive state your blood has low blood sugar levels.
what is sex?
Soumyakanta Reply
Your biological sex is determined by your sex chromosome which is pair number 23. if you have a XX pair then you are a female. if you have XY pair then you are a male.
the sex chromosomes are called as allosome
True, the other 22 pairs are called autosomes :)
why the left hemisphere controls the right side body parts and right hemisphere controls the left side body parts?
because it is like that
It has to do with how the neuronal pathway are intertwined to opposites sides of the body I think. A motor output from the left cerebral hemisphere (motor cortex) will end up stimulating your right side of the body.
brother Carmelo don't miander, sex ,it just the state of being a male or female
Your biological sex is tied to your DNA (genetic information). A male have testes and female have ovaries which are reproductive organs is tied to your genetic information (sex chromosome). If an individual feels like it is either a male or female is called gender identity.
thanks our beloved brother Carmelo
that's great learning something everyday
what is anatomy
most blood enters the ventricle during what phase?
Tina Reply
rapid ejection
Most of the blood in the heart enters the ventricles during the diastolic phase.
which of the following is the types of personal protective equipment protects mucous membranes?
Most (not all) mucous membranes secrete mucus because they contain goblet cells in between the epithelial tissue. Mucus coats the layers of epithelium and traps particles. The epithelial type is either stratified squamous, simple columnar, or pseudostratified columnar in mucous membranes.
Are you a professor Carmelo?
No sir, I'm a nursing and biology student as well in university.
why the fever occurs if any injury or pain occurs
fever is de best indication to show there is an infection
what is the actual mechanism of fever
correct Tanveer, the normal internal body temperature is 98.6 Fareinheit. When the temperature rises above 100 fareinheit, it is usually an indication of infection.
White blood cells which protect you against foreign antigens become active and release cytokines (pyrogens) during infection which causes the hypothalamus to raise your internal body temperature.
thank you so much.really you are very intelligent.
thank you. you are very intelligent
the mechanism of fever appears to be a defensive reaction by the body against infectious disease. when bacteria or viruses invade the body and cause tissue injury one of de body immune system's responses is to produce pyrogen
Yes, the hypothalamus responds to pyrogens by raising your body temperature. The reason your hypothalamus does this is to stunt the growth and metabolism of whatever is causing the infection (bacteria, virus, fungi protozoa, etc.)
how the kidney transplantation is done
Which university are you studying?
and all of you ,university
Really so talented
I was asking Carmelo?
Georgia State University.
oh nice! I'm in University of Texas
vicious this is chaptare I reading 5day after
pleas sir can u teach me
not sure, can u help me?
I'm in University of Technology, Jamaica
why do you not helf me
what difference exist between anatomy and physiology?
Collins Reply
Anatomy: study of the structure of the body parts and their relationship to one another
Physiology: Study of the function of body parts and how they work to carry out life-sustaining activities
physiology function and anatomy location
anatomy refers to the study of the body parts and their relationship to each other while physiology deals with functioning of those body parts
Yes of course.In layman language Anatomy is study of internal organs, whereas physiology is study of how those organs function. Anatomy is is related to how they look their shape size... Physiology is how they work
anotomy dealt with the external and internal stuctural features of body and their constituent physiology deals with the functioning or action of that stucture
Anatomy is the study of the structures (internal and external) of a living organism. Physiology is the study of how the structures of a living organism function often at a molecular and cellular level.
anatomy is the structure of different body parts of human body and physiology is the normal body function of body parts of the human body
anatomy is study of structure of the body e.g, system,organ's size shape location and physiology is the study of function of the body eg,eye ball movement , release of hormones , circulation of blood etc
thanks guys. I appreciate
thanks bro
Explain the meaning of life in a scientific manner
probably it doesn't have a meaning yet it can be realised by certain signs that have a scientifically defined terms?!!!!
At least in a scientific manner, scientists have agreed that production and use of cellular energy, as well as growth and reproduction are essential when defining what is alive in a biological sense. For example, viruses are not considered alive because they cannot grow or reproduce by themselves.
this virus issues is being challenged currently.
what z your conclusion over virus bro?
pipo what is the relationship between T- cells ( specifically T-helper), & all three line of defence mechanism
anatomy is the science that deals with the study of the human structure whilst physiology is a science that covers the function and process of the body structure.
defien brache of Anatomy
anatomy is the study of internal and external body parts while physiology is the science that covers the function and process of the body structure.
what is blood fluid
Adefarasin Reply
what is menstrual cycle
periodic flow of blood from the female human vigina, after an unfertlized egg has been released from the ovaries
the shedding of of the uterine walls,that occurs when fertilization doesn't occur
fertilization after occur menstrual cycle
it's called menses
menses:(menstrual cycle) A monthly shedding of uterine lining and blood. For up to 3 to 7 days every 28 days.
The menstrual cycle is divided into multiple phases. Menses is the last phase of the cycle when fertilization doesn't occur and endometrium of the uterus shed (stratum functionalis) due to lack of estrogen and progesterone signaling.
The lack of estrogen and progesterone signaling is due to the degeneration of the corpus lueteum when fertilization doesn't occur.
Blood fluid: Blood is composed of blood plasma + formed elements. The blood plasma is 55% of blood volume and it contains 90% of water. It also contains ions, hormones, gases, protein transporters, etc. Blood plasma is also considered extracellular fluid.
The formed elements of blood include RBCs (45-50% of blood), WBCs and Plalets (less than 1% of blood).
Almost forgot, blood plasma also carries nutrients which is obviously very important for survival.
we appreciate bro, our studies are becoming easy & easy
what difference between zink and jesta
Anurag Reply
what and where is the midsagittal
Akpeji Reply
the plane dividing the body longitudinal splitting right and left halves symmetrically
sagittal. mid sagittal
human body largest organ.....
jasveer Reply

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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