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Human heart

This photo shows a human heart.
This artist’s conception of the human heart suggests a powerful engine—not inappropriate for a muscular pump that keeps the body continually supplied with blood. (credit: Patrick J. Lynch)

Chapter objectives

After studying this chapter, you will be able to:

  • Identify and describe the interior and exterior parts of the human heart
  • Describe the path of blood through the cardiac circuits
  • Describe the size, shape, and location of the heart
  • Compare cardiac muscle to skeletal and smooth muscle
  • Explain the cardiac conduction system
  • Describe the process and purpose of an electrocardiogram
  • Explain the cardiac cycle
  • Calculate cardiac output
  • Describe the effects of exercise on cardiac output and heart rate
  • Name the centers of the brain that control heart rate and describe their function
  • Identify other factors affecting heart rate
  • Describe fetal heart development

In this chapter, you will explore the remarkable pump that propels the blood into the vessels. There is no single better word to describe the function of the heart other than “pump,” since its contraction develops the pressure that ejects blood into the major vessels: the aorta and pulmonary trunk. From these vessels, the blood is distributed to the remainder of the body. Although the connotation of the term “pump” suggests a mechanical device made of steel and plastic, the anatomical structure is a living, sophisticated muscle. As you read this chapter, try to keep these twin concepts in mind: pump and muscle.

Although the term “heart” is an English word, cardiac (heart-related) terminology can be traced back to the Latin term, “kardia.” Cardiology is the study of the heart, and cardiologists are the physicians who deal primarily with the heart.

Questions & Answers

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stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum
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endocrine is a system through which the secretions of cell directly poured into blood.
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environment factor that cause a cell to respond
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deference between RNA and DNA
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.DNA stands for Deoxyribonucleic Acid. The sugar portion of DNA is 2-Deoxyribose.RNA stands for Ribonucleic Acid.  The sugar portion of RNA is Ribose.2.The helix geometry of DNA is of B-Form (A or Z also present).The helix geometry of RNA is of A-Form.3.DNA is a double-stranded molecule consisting o
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walker Reply
A heart is an organ in the circulatory system that pumps blood throughout the systemic regions
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Anatomy is the study of internal and external structures and the relationship among body parts. (the study of structure).
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asthma is a lungs related disorder in which there is difficulty in breathing due to some allergic factors, their is inflamation of alveoli of respiratory part of lungs.also decreases the surface area.
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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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