Normal heart sounds are caused by which of the following events?

friction of blood against the chamber walls

excitation of the sinoatrial (SA) node

What is true of the semilunar valves?

They lie between ventricles and the large arteries that leave the ventricles on each side of the heart.

They lie between the atria and the ventricular chambers on each side of the heart.

They are both on the left side of the heart.

They are both on the right side of the heart.

The mitral valve is located between the ________.

right ventricle and pulmonary trunk

left ventricle and pulmonary trunk

If the vagal nerves to the heart were cut, the result would be that ________.

the heart rate would increase by about 25 beats per minute

the heart would stop, since the vagal nerves trigger the heart to contract

the atrioventricular (AV) node would become the pacemaker of the heart

parasympathetic stimulation would increase, causing a decrease in heart rate

The left ventricular wall of the heart is thicker than the right wall in order to ________.

pump blood with greater pressure

accommodate a greater volume of blood

expand the thoracic cage during diastole

pump blood through a smaller valve

If the mitral valve is unable to close properly, ________.

blood could flow back into the left atrium

blood could flow back into the right ventricle

blood could flow back into the left ventricle

blood could flow back into the right atrium

If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells, ________.

tetanic contractions might occur, which would stop the heart's pumping action

pacemaker cells would cease to spontaneously depolarize

it would be much longer before cardiac cells could respond to a second stimulation

contractions would last as long as the refractory period

If cardiac muscle is deprived of its normal blood supply, damage would primarily result from ________.

a lack of nutrients to feed into metabolic pathways

an inadequate supply of lactic acid

a decrease in the number of available mitochondria for energy production

During the isovolumetric relaxation phase of the cardiac cycle, _______.

atrioventricular, aortic, and pulmonary valves are closed

atrioventricular valves are open; aortic and pulmonary valves are closed

atrioventricular valves are closed; aortic and pulmonary valves are open

atrioventricular, aortic, and pulmonary valves are open

During the period of ventricular filling, ________.

blood flows mostly passively from the atria through the atrioventricular (AV) valves into the ventricles

the aortic and pulmonary semilunar valves are open

pressure in the heart is at its peak

The atrioventricular (AV) valves are closed ________.

when the ventricles are in systole

by the movement of blood from atria to ventricles

when the ventricles are in diastole

while the atria are contracting

chapter 18

Authored by wc_shuttlerun377 wc_shuttlerun377

Science

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Compared to skeletal muscle, cardiac muscle ________.

lacks striations

has more nuclei per cell

cells are larger than skeletal muscle cells

has gap junctions that allow it to act as a functional syncytium

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Heart contraction is the systole.

True

False

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT an age-related change affecting the heart?

thinning of the valve flaps

fibrosis of cardiac muscle

atherosclerosis

decline in cardiac reserve

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Norepinephrine acts on the heart by ________.

causing a decrease in stroke volume

causing threshold to be reached more quickly

decreasing heart contractility

blocking the action of calcium

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The myocardium receives its blood supply from the coronary arteries.

True

False

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is NOT a vessel that brings blood directly into the right atrium?

superior vena cava

coronary sinus

pulmonary vein

inferior vena cava

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Damage to the ________ causes heart block.

atrioventricular (AV) node

atrioventricular (AV) valves

atrioventricular (AV) bundle

sinoatrial (SA) node

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chapter 18

Compared to skeletal muscle, cardiac muscle ________.

Heart contraction is the systole.

Which of the following is NOT an age-related change affecting the heart?

Norepinephrine acts on the heart by ________.

The myocardium receives its blood supply from the coronary arteries.

Which is NOT a vessel that brings blood directly into the right atrium?

Damage to the ________ causes heart block.

Which chambers of the heart contain oxygenated blood?

Normal heart sounds are caused by which of the following events?

The semilunar valves are responsible for preventing blood flow back into the atria.

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