Essay on Anatomy and Physiology

2185 Words Oct 24th, 2015 9 Pages
Anatomy and Physiology Task 1

1. Discuss your dissection of the sheep heart and the cardiovascular system of the fetal pig by doing the following:
a. Describe the similarities and differences between the fetal pig heart and the sheep heart.
1. Size
2. The left ventricular wall is thicker in the sheep than the fetal pig.
They both have 2 atria and 2 ventricles.
b. Describe the four valves of the heart, including their name, location, and function.
The four valves of the heart are the tricuspid valve, the pulmonic valve, the mitral valve, and the aortic valve.
The tricuspid valve: It is located between the right atria and the right ventricle. It is comprised of three “flap-like cusps” which when in
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• Aortic and bicuspid mitral valves are present in the left side, whereas tricuspid valve and pulmonary semilunar valve are present in the right side.
• The special types of tissues that help to generate nerve impulse can be found only in the right side. These are the SA node (pacemaker) and AV node. d. Compare the structure of the atrioventricular valves to the structure of the semilunar valves.
To make certain that the tricuspid and the mitral valves (atrioventricular valves/AV) do not turn inside-out, they are attached to small papillary muscles by strong tendons known as cordae tendineae. The contraction of the papillary muscles is synchronized with that of the ventricles, which results in a constant tension on the valve leaflets.
As compared to the atrioventricular valves, the semilunar valves (consists of the pulmonic and aortic valves) are smaller and have self-supporting cusps with no chordae tendinae or papillary muscles. When closed, the 3 symmetrical cusps support one another. e. Describe the appearance of the papillary muscles.
The papillary muscles are short and have a cone shaped appearance.
f. Describe the path that blood takes starting in the right atrium and ending in the superior/inferior vena cava.
1. The right atrium receives deoxygenated blood from

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