<< Chapter < Page Chapter >> Page >

4.Analyse the results by comparing the total score with the following descriptors:

30 marks- you take very good care of your heart. Well done!

25 marks- you take good care of your heart. Keep it up!

20 marks- you take reasonably good care of your heart but need to work

on a few aspects where you scored 0.

15 marks- you need to take better care of your heart.

0-10 marks- you do not look after your heart at all. It’s time to make a

change to a healthier lifestyle.

Assessment Rubric

  • Results
0- not done1- poorly presented. 2- average presentation of results, but missing some detail.3- average presentation of results, including all salient featuresand information.4- good presentation of results, but missing some detail.5- good presentation of results, including all salient features and information.
5

Rich media:

Khan Academy

http :// www . khanacademy . org / video / circulatory - system - and - the - heart ? playlist = Biology

Cardiac Magnetic Resonance imaging of Beating heart: Large magnets are used to create images of the heart inside the body, without the need for surgery.

http://upload.wikimedia.org/wikipedia/commons/7/73/Four_chamber_cardiovascular_m agnetic_resonance_imaging.gif

View from the top

http://commons.wikimedia.org/wiki/File:Beating_Heart_axial.gif

View from the side

http://commons.wikimedia.org/wiki/File:Cardiac_mri_ani_sagittal_bionerd.gif

Blood vessels

Structure and functioning of arteries, veins, capillaries and valves

Arteries

  • Arteries carry blood from away from the heart. The pressure created by the pumping heart forces blood down the arteries.
  • Arteries have three layers.
  1. Outside layer – connective tissue
  2. Middle layer – smooth muscle, allows contraction of the arteries to regulate blood flow and pressure
  3. Inside layer – single layer of tightly connected simple squamous endothelial cells
  • The large arteries close to the heart branch into smaller arterioles (smaller arteries) and eventually branch into capillaries.

Capillaries

  • Capillaries are little more than a single layer or endothelial cells.
  • Capillaries form intricate networks throughout the tissues.
  • They allow water, nutrients and gasses to diffuse out of the blood and waste materials to diffuse into the blood.
  • This exchange occurs between the blood and the interstitial fluid.
  • The interstitial fluid is the fluid surrounding the cells.
  • The blood never comes into contact with the cells.
  • The blood and interstitial fluid exchange material, and the interstitial fluid then exchanges material with the cells.

Veins

  • The intricate networks formed by the capillaries eventually converge to form venules, (small veins)
  • The venules then converge to form veins which return the blood to the heart.
  • Veins only consist of two layers.
  1. The outer layer is made up of connective tissue
  2. The inner layer is made up of endothelial cells.

Valves

  • Once the blood has passed through the capillaries very little blood pressure remains to return blood to the heart.
  • Instead of pressure from the heart veins use a series of valves to force blood to return to the heart.
  • Contraction of the muscles squeezes the veins, pushing the blood through them.
  • The valves cause the blood to flow in only one direction, back to the heart.

Questions & Answers

what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
why and for what was five kingdom of classification of organisms introduced
SUBHIKSHA Reply
give the ans as fast as possible
SUBHIKSHA
Comment on the ozone depletion over the period of 1982 to 1996
Mpho Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Siyavula: life sciences grade 10. OpenStax CNX. Apr 11, 2012 Download for free at http://cnx.org/content/col11410/1.3
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Siyavula: life sciences grade 10' conversation and receive update notifications?

Ask
Saylor Foundation
Start Quiz
Miranda Reising
Start Quiz
Edgar Delgado
Start Quiz