Question 1

A resting heart rate of less than 60 beats per minute is identified as ________.

Accepted Answer

The answer of A resting heart rate of less than...

Question 2

If blood pressure doubled at the same time that the peripheral resistance doubled,the blood flow through a vessel would be

Accepted Answer

According to the equation Q = ΔP/R (where Q is blood flow, ΔP is change in pressure, and R is resistance), if both ΔP and R double, the numerator and denominator will cancel out each other and blood flow will remain unchanged.

Question 3

The period of time from the beginning of one heartbeat to the beginning of the next is termed the ________.

Accepted Answer

The answer of The period of time from the beginning...

Question 4

The ________ is the amount of blood in a ventricle after it has contracted and before it begins to refill.

Accepted Answer

The answer of The ________ is the amount of blood...

Question 5

A tracing of the electrical activity of the heart,monitored by electrodes placed on the skin,is called a(n)________.

Accepted Answer

The answer of A tracing of the electrical activity of...

Question 6

The rule that states "Within limits,the heart pumps all of the blood that returns to it" is known as the ________.

Accepted Answer

The answer of The rule that states "Within limits,the heart...

Question 7

The period when blood is pushed into the arteries is called ________.

Accepted Answer

The answer of The period when blood is pushed into...

Question 8

Narrowing of the opening of a heart valve is referred to as ________.

Accepted Answer

The answer of Narrowing of the opening of a heart...

Question 9

As a result of the long refractory period,cardiac muscle cannot exhibit

Accepted Answer

Tetany is a sustained muscle contraction that occurs when the muscle is stimulated rapidly without enough time for relaxation in between. Because cardiac muscle has a long refractory period, it cannot experience tetany. Tonus (continuous partial contraction) and treppe (increased force of contraction with repeated stimulation) are possible in cardiac muscle. Recruitment (increasing numbers of motor units being activated for a stronger contraction) and fatigue (decreased force of contraction with prolonged activity) are not relevant for cardiac muscle as it does not have motor units and does not fatigue easily.

Question 10

Which statement is NOT true regarding cardiac muscle?

Accepted Answer

Cardiac muscle cells do not obey the all-or-none law of contraction; this law applies to the whole heart, not individual cardiac muscle cells.

Question 11

Listening to the heart through the chest wall is called ________.

Accepted Answer

The answer of Listening to the heart through the chest...

Question 12

Which of the following conditions would have the greatest effect on peripheral resistance?

Accepted Answer

Peripheral resistance is inversely proportional to the fourth power of the vessel diameter. Therefore, doubling the diameter of a vessel (choice B) would have the greatest effect on peripheral resistance.

Question 13

A resting heart rate above 100 beats per minute is identified as ________.

Accepted Answer

The answer of A resting heart rate above 100 beats...

Question 14

The contraction phase of the cardiac cycle is termed ________.

Accepted Answer

The answer of The contraction phase of the cardiac cycle...

Question 15

If the membranes of the cardiac muscle cells in the SA node become more permeable to potassium ions,

Accepted Answer

Potassium ions leaving the cell will cause the membrane potential to become more negative, which will slow or decrease the rate of depolarization in the SA node. This will result in a decrease in heart rate.

Question 16

The amount of blood returning to the heart is the ________.

Accepted Answer

The answer of The amount of blood returning to the...

Question 17

Abnormal patterns of cardiac activity are known as ________.

Accepted Answer

The answer of Abnormal patterns of cardiac activity are known...

Question 18

An increase in blood vessel diameter is known as ________.

Accepted Answer

The answer of An increase in blood vessel diameter is...

Question 19

Place these structures in the order that blood returning to the heart from the body would pass through them.
1)right ventricle
2)left atrium
3)right atrium
4)pulmonary artery
5)left ventricle
6)pulmonary vein

Accepted Answer

Blood returning to the heart from the body would first enter the right atrium, then pass through the tricuspid valve into the right ventricle. From there, it is pumped through the pulmonary valve into the pulmonary artery, which carries it to the lungs for oxygenation. After oxygenation, the blood returns to the heart via the pulmonary veins, entering the left atrium. From there, it passes through the mitral valve into the left ventricle where it is pumped out to the body through the aorta. Therefore, the correct order is: 3, 1, 4, 6, 2, 5.

Question 20

The ________ is the amount of blood in a ventricle at the beginning of systole.

Accepted Answer