Anatomy and Physiology Answer Key

This ensures that the heart has an enforced rest and

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Unformatted text preview: factors have a higher chance of developing coronary heart disease (CHD) because the risks are cumulative and add up to pose a greater total risk. As seen in the column chart, the risk of CHD is cumulative and rises by 5-10% approximately with the addition of each of the risk factors indicated. Smoking combined with high HDL cholesterol and diabetes pose the greatest increased risk of CHD. Extra text removed and letter answers have been placed for each cycle. E AVC (c) P E AVO AVC 4. FV Review of the Human Heart (page 120) Anatomy and Physiology 1. 2. 3. (A) Cardiac nerve (sympathetic nerve is acceptable). (B) Baroreceptors in the vena cava and right atrium. (C) Vagus nerve (parasympathetic nerve is acceptable). (D) Aortic baroreceptors. (1) Sinoatrial node (SAN). (2) Atrioventricular node (AVN). (3) Bundle of His (atrioventricular bundle). (4) Right ventricle. (5) Pulmonary artery. (6) Left atrium. (7) Purkinje fibers. (8) Left ventricle. A = Contraction of the atria. B = Contraction of the ventricles. C = Relaxation and recovery of ventricles. Correcting Heart Problems (page 123) 1. (a) Tissue valves: A shorter life-span means the valves require regular replacement (every 10 years or so). (b) Synthetic valves: Have a tendency to produce blood clots which increase the risk of stroke. Patients have long-term drug therapy to prevent clot formation. 2. Tissue valves have fewer complications associated with their use, drugs are not required to prevent rejection, and the shorter life-span of the valve is no problem in elderly patients. 3. Heart patients need careful supervision because the factors in their lifestyle that lead to the heart disease in the first instance will still be present after surgery. It is desirable that after surgery patients adopt a healthy diet, include some everyday physical activity in their routine, and try to avoid stress as much as possible. Use of an artificial pacemaker to regulate heart rhythm. Cardiovascular Disease (page 121) 1. As it develops, atherosclerosis l...
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This document was uploaded on 01/28/2014.

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