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True or False Quiz
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1
All parasympathetic nerve fibers to the heart innervate the sinoatrial node.
A)True
B)False
2
Cardiac control centers in the medulla oblongata receive input from baroreceptors located in some of the arteries.
A)True
B)False
3
Stroke volume is directly proportional to end-diastolic volume.
A)True
B)False
4
The heart's contractility is adjusted so that normally each ventricle expels all the blood contained in it, leaving none behind in the chamber.
A)True
B)False
5
The sympathetic nervous system has no significant effect on the ventricular contractility.
A)True
B)False
6
If the ventricles did not fill with blood at all, but the electrical conduction system stimulated them to contract anyway, the contraction would be very weak.
A)True
B)False
7
In spite of the fact that the systemic vessels cover substantially more total length than the pulmonary vessels, the same amount of blood must flow through both of these systems in a given time.
A)True
B)False
8
Since arteries are more muscular than veins, they are said to have a greater compliance.
A)True
B)False
9
Since the veins contain most of the body's blood at any one time, they have a higher blood pressure than any other type of vessel.
A)True
B)False
10
About 80% of the body's extracellular fluid is in the cells.
A)True
B)False
11
The net filtration pressure of the capillaries is mathematically equal to the hydrostatic pressure that tends to promote filtration minus the osmotic pressure than tends to promote absorption.
A)True
B)False
12
The oncotic pressure of the blood tends to promote uptake of water from the tissue fluid into the blood plasma.
A)True
B)False
13
If the Starling forces formula, (Pc + pi) - (Pi + pp), yields a positive number, it means the net Starling forces promotes absorption of fluid into a capillary.
A)True
B)False
14
All fluid that is filtered at the arteriolar end of a capillary and percolates through the tissues must be reabsorbed at the venular end in order to maintain plasma fluid balance.
A)True
B)False
15
Liver disease tends to reduce the blood pressure and lead to edema.
A)True
B)False
16
All of the fluid filtered by the capillaries of the kidneys is ultimately excreted as urine.
A)True
B)False
17
Less urine is excreted when the ADH level is low.
A)True
B)False
18
Decreased osmolality of the blood leads to decreased secretion of ADH.
A)True
B)False
19
Both ADH and aldosterone promote retention of water when one is dehydrated, but aldosterone does not lower the blood osmolality.
A)True
B)False
20
Angiotensinogen is secreted by the kidneys and then converted in the lungs to the vasoconstrictor named angiotensin II.
A)True
B)False
21
Parasympathetic fibers innervating blood vessels are always cholinergic and stimulate vasodilation.
A)True
B)False
22
All blood vessels receive both sympathetic and parasympathetic nerve fibers so their diameters can be regulated by a balanced "push-pull" homeostatic control mechanism.
A)True
B)False
23
The sympathetic nervous system is much more important than the parasympathetic system in regulating arterial blood flow.
A)True
B)False
24
A drop in arterial blood pressure causes cerebral arteries to constrict.
A)True
B)False
25
Blood flow through the coronary arteries is greatest during ventricular disatole and drops during systole.
A)True
B)False
26
Coronary blood flow is reduced during systole so the myocardium must temporarily rely on anaerobic respiration.
A)True
B)False
27
Sustained muscle contractions will cause faster onset of fatigue than a series of short contractions because the blood flow through a skeletal muscle is diminished or shut off during strong contractions.
A)True
B)False
28
During heavy exercise, blood circulation to the skin increases to dissipate the excess body heat.
A)True
B)False
29
During heavy exercise, the heart beats faster and has less time to fill between beats, so the end-diastolic volume is reduced.
A)True
B)False
30
Cerebral blood flow remains fairly constant at about 750 ml/min, in spite of changes in brain activity, blood pressure, and blood flow to other organs.
A)True
B)False
31
Cerebral arteries constrict when blood pressure rises to about 200 mmHg.
A)True
B)False
32
The skin is vital to thermoregulation of the body and therefore cannot tolerate a reduced flow of blood for very long.
A)True
B)False
33
The baroreceptor reflex responds to changes in blood pressure to increase or decrease heart rate and total peripheral resistance.
A)True
B)False
34
Orthostatic hypotension is due to a delay in the onset of the baroreceptor reflex.
A)True
B)False
35
The sounds of Korotkoff are created by turbulent blood flow through an occulded blood vessel.
A)True
B)False
36
Laminar blood flow through the brachial artery cannot be heard with the stethoscope.
A)True
B)False
37
In the auscultatory method of taking blood pressure, no sound is heard when the cuff is inflated above the systolic pressure because laminar flow of blood is silent.
A)True
B)False
38
Pulse pressure is the difference between systolic and diastolic blood pressures.
A)True
B)False
39
If a person had an arterial blood pressure of 102/62, the mean arterial pressure would be 82 mmHg.
A)True
B)False
40
Essential hypertension is high blood pressure of unknown cause.
A)True
B)False
41
"Most patients with hypertension will have low levels of renin secretion via a negative feedback loop inhibition."
A)True
B)False
42
By the time a patient shows any symptoms of hypertension, there usually has already been considerable damage to the circulatory system.
A)True
B)False
43
Hypertension can be treated with anti-diuretic drugs.
A)True
B)False
44
Hypovolemic shock results from an infection.
A)True
B)False
45
Hypovolemic shock tends to cause a patient to have a rapid pulse and cold, clammy skin.
A)True
B)False





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