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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.
AVC (c) P E
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
(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.
- Winter '13