BIOM 525 Liberty University Human Physiology Lecture Quiz 3 practice.pdf

Quiz 3

Liberty University

BIOM 525

Human Physiology Lecture

 Question 1

1 out of 1 points

Digoxin, exerts a positive ionotropic effect on the heart causing an increase in stroke

volume and a decrease in right atrial pressure.

Selected Answer:

True

Correct Answer:

True

 Question 2

0 out of 1 points

Which of these statements about hemodynamics is not correct?

Selected

Answer:

The mean arterial pressure is influenced more by diastolic pressure than

by systolic pressure (because a greater proportion of each cardiac cycle

is spent in diastole).

Correct

Answer:

The compliance of the blood vessels, particularly of the veins, increases

pulse pressure—the more compliant the blood vessel, the more volume

that can be added to it causing an increase in pressure.

 Question 3

1 out of 1 points

This protein is phosphorylated following sympathetic stimulation of cardiac muscles

leading to an increased activity of SERCA and clearance of cytosolic Ca++;

Selected Answer:

Phospholamban

Correct Answer:

Phospholamban

 Question 4

1 out of 1 points

The aortic bodies located along the aortic arch are most sensitive to which of the

following factors?

Selected Answer:

Decreased arterial PO2

Correct Answer:

Decreased arterial PO2

 Question 5

1 out of 1 points

Which of these do you suspect will result from the activation of the carotid bodies?

Selected Answer:

All of these

Correct Answer:

All of these

 Question 6

1 out of 1 points

The administration of a drug that increases total peripheral resistance will result in a

decrease in venous return for a given right arterial pressure.

Selected Answer:

True

Correct Answer:

True

 Question 7

1 out of 1 points

Which of these represents repolarization of the ventricles?

Selected Answer:

T wave

Correct Answer:

T wave

 Question 8

0 out of 1 points

Which of these conditions is least likely to promote turbulent blood flow?

Selected Answer:

Thrombi

Correct Answer:

Polycythemia

 Question 9

1 out of 1 points

In a patient with chronic systemic hypertension, the baroreceptor reflex does not

reduce the blood pressure back to the normal range because;

Selected Answer:

The baroreceptors are desensitized to blood pressure elevations

Correct Answer:

The baroreceptors are desensitized to blood pressure elevations

 Question 10

1 out of 1 points

Which of these do you suspect will be increased in a patient with aortic stenosis?

Selected Answer:

Left ventricular end-systolic volume

Correct Answer:

Left ventricular end-systolic volume

 Question 11

1 out of 1 points

Which of these statements is correct about cardiovascular hemodynamics?

Selected Answer:

All of these are correct

Correct Answer:

All of these are correct

 Question 12

0 out of 1 points

Local blood flow regulation is most importantly influenced by the sympathetic

innervation in the;

Selected Answer:

Pulmonary vessels

Correct Answer:

Skin vessels

 Question 13

1 out of 1 points

If the R-R interval is 650 ms (0.65s), what is the heart rate?

Selected Answer:

92 beats/minute

Correct Answer:

92 beats/minute

 Question 14

1 out of 1 points

Which of these is not a conducting cell of the heart?

Selected Answer:

Coronary nodal cells

Correct Answer:

Coronary nodal cells

 Question 15

1 out of 1 points

According to the LaPlace law of a sphere, dilated cardiomyopathy which reduces the

thickness of the ventricular wall will have this effect on ventricular function;

Selected Answer:

It will produce a lower ventricular pressure

Correct Answer:

It will produce a lower ventricular pressure

 Question 16

1 out of 1 points

The physiologic splitting of the second heart sound during inspiration results from;

Selected

Answer:

The prolongation of ejection time delays closure of the pulmonic valve

relative to the aortic valve

Correct

Answer:

The prolongation of ejection time delays closure of the pulmonic valve

relative to the aortic valve

 Question 17

1 out of 1 points

With regard to local blood flow regulation, which of these substances will produce

vasoconstriction?

Selected Answer:

Serotonin

Correct Answer:

Serotonin

 Question 18

1 out of 1 points

The longest portion of the sinoatrial node action potential is;

Selected Answer:

Phase 4

Correct Answer:

Phase 4

 Question 19

1 out of 1 points

Which of these statements about tension development in cardiac muscles is

accurate?

Selected Answer:

All are correct

Correct Answer:

All are correct

 Question 20

1 out of 1 points

These conditions promote edema formation by decreasing the capillary oncotic

pressure except;

Selected Answer:

Heart Failure

Correct Answer:

Heart Failure

 Question 21

1 out of 1 points

Which of these will you expect to find in a patient with congestive cardiac failure and

fluid overload?

Selected Answer:

Increased ANP secretion

Correct Answer:

Increased ANP secretion

 Question 22

1 out of 1 points

Which of these is not a common site of low-pressure baroreceptors?

Selected Answer:

Carotid sinus

Correct Answer:

Carotid sinus

 Question 23

1 out of 1 points

You are evaluating a patient with suspected acute renal failure, the blood flow in the

right kidney is 450ml/min, the right arterial pressure is 90mmHg and right arterial

venous pressure is 20mmHg. What is the right renal vascular resistance in this

patient?

Selected Answer:

0.16mmHg/ml per min

Correct Answer:

0.16mmHg/ml per min

 Question 24

1 out of 1 points

The dicrotic notch of the arterial pressure curve is produced by;

Selected

Answer:

Closure of the aortic valve and retrograde blood flow toward the

aorta

Correct Answer:

Closure of the aortic valve and retrograde blood flow toward the

aorta

 Question 25

1 out of 1 points

Which of these does not define a normal sinus rhythm?

Selected Answer:

The S wave must precede a Q wave

Correct Answer:

The S wave must precede a Q wave

 Question 26

1 out of 1 points

Which of these is not an event of atrial systole in the cardiac cycle?

Selected Answer:

The T wave is present

Correct Answer:

The T wave is present

 Question 27

1 out of 1 points

Propranolol, a non-selective beta-adrenergic antagonist can be used in treating a patient with a

tachyarrhythmia originating in the SA node.

Selected Answer:

True

Correct Answer:

True

 Question 28

1 out of 1 points

Which of these best describes the effect of an increased heart rate on the reduced

ventricular filling phase of the cardiac cycle?

Selected Answer:

It reduces end-diastolic volume of the ventricle

Correct Answer:

It reduces end-diastolic volume of the ventricle

 Question 29

1 out of 1 points

During the isovolumetric ventricular relaxation, ______ occurs?

Selected Answer:

All of these

Correct Answer:

All of these

 Question 30

1 out of 1 points

Sympathetic stimulation of the SA node causes an increase in inward Ca++ current, a decreased action

potential threshold and an increased heart rate.

Selected Answer:

True

Correct Answer:

True

 Question 31

1 out of 1 points

The lymphatic system

Selected Answer:

returns interstitial fluid to the plasma

Correct Answer:

returns interstitial fluid to the plasma

 Question 32

1 out of 1 points

High central venous pressure is often due to

Selected Answer:

congestive heart failure

Correct Answer:

congestive heart failure

 Question 33

1 out of 1 points

The steepest pressure gradient occurs as blood flows

Selected Answer:

through the arterioles

Correct Answer:

through the arterioles

 Question 34

1 out of 1 points

Myogenic autoregulation means that

Selected Answer:

stretched smooth muscle in a blood vessel constricts reflexively

Correct Answer:

stretched smooth muscle in a blood vessel constricts reflexively

 Question 35

1 out of 1 points

Reducing afterload will result in

Selected Answer:

no change in the shortening of the muscle cells

Correct Answer:

no change in the shortening of the muscle cells

 Question 36

1 out of 1 points

Mean arterial pressure=

Selected Answer:

diastolic pressure + (pulse pressure/3)

Correct Answer:

diastolic pressure + (pulse pressure/3)

 Question 37

1 out of 1 points

Colloid osmotic pressure in plasma is fairly constant in a healthy person. How would protein starvation

affect this pressure?

Selected Answer:

It would be reduced and lead to greater filtration than absorption.

Correct Answer:

It would be reduced and lead to greater filtration than absorption.

 Question 38

1 out of 1 points

Reactive hyperemia is

Selected Answer:

increased blood flow following a period of reduced blood flow.

Correct Answer:

increased blood flow following a period of reduced blood flow.

 Question 39

1 out of 1 points

Arteriole pressure is dependent on

Selected Answer:

CO, TPR, and compliance

Correct Answer:

CO, TPR, and compliance

 Question 40

0 out of 1 points

Sympathetic stimulation to visceral smooth muscles leads to

Selected Answer:

only contraction

Correct Answer:

None of the answers are correct.

 Question 41

1 out of 1 points

Which is true of parasympathetic innervation to the heart? Choose all that apply.

Selected Answers:

innervates AV node.

decreases heart rate.

causes K+ to leave target cells.

releases Ach onto target cells.

Correct Answers:

innervates AV node.

decreases heart rate.

causes K+ to leave target cells.

releases Ach onto target cells.

 Question 42

1 out of 1 points

Which would have the highest resistance?

Selected Answer:

Three vessels with resistances of 1, 2, and 3 arranged in series

Correct Answer:

Three vessels with resistances of 1, 2, and 3 arranged in series

 Question 43

1 out of 1 points

Which of these describes a characteristic of capillaries?

Selected Answer:

Blood flow is slower in them compared to other vessels.

Correct Answer:

Blood flow is slower in them compared to other vessels.

 Question 44

1 out of 1 points

Put the following in order for the correct pathway of the electrical signal through the heart.

The signal starts in the [u] and travels through the [v] to the [w]. From there it goes through the [x],

down the [y], and finally through the [z].

Selected

Answer:

Put the following in order for the correct pathway of the electrical signal through the

heart.

The signal starts in the SA node and travels through the internodal pathway to

the AV node. From there it goes through the bundle of His, down the bundle

branches, and finally through the Perkinje fibers.

Correct

Answer:

Put the following in order for the correct pathway of the electrical signal through the

heart.

The signal starts in the SA node and travels through the internodal pathway to

the AV node. From there it goes through the bundle of His, down the bundle

branches, and finally through the Perkinje fibers.

 Question 45

1 out of 1 points

Stretching cardiac myocytes will most likely result in which of these?

Selected

Answer:

changes the degree of overlap between myosin and actin and affects tension

development.

Correct Answer:

changes the degree of overlap between myosin and actin and affects tension

development.

 Question 46

1 out of 1 points

When measuring a patient's blood pressure, sounds of Korotkoff are heard _____

Selected Answer:

between systole and diastole.

Correct Answer:

between systole and diastole.

 Question 47

1 out of 1 points

Choose all that are part of the cardiovascular system's role in homeostasis

Selected Answers:

transport nutrients to tissues

regulation of heat

transport gases

transport hormones

Correct Answers:

transport nutrients to tissues

regulation of heat

transport gases

transport hormones

 Question 48

1 out of 1 points

Which will increase stroke volume? Choose all that apply.

Selected Answers:

increased heart rate

increased preload

increased venous return

increased phosphorylation of phospholambin

Correct Answers:

increased preload

increased venous return

increased phosphorylation of phospholambin

 Question 49

1 out of 1 points

Which is true of action potentials in cardiac autorhythmic cells but not cardiac contractile cells.

Selected Answer:

unstable resting potential, rising phase due to Ca++

Correct Answer:

unstable resting potential, rising phase due to Ca++

 Question 50

1 out of 1 points

Which vessels contribute the most to resistance?

Selected Answer:

arterioles, due to their large amount of smooth muscle

Correct Answer:

arterioles, due to their large amount of smooth muscle

BIOM 525 Liberty University Human Physiology Lecture Quiz 3 practice.pdf

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