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Biology 202 > Heart > Flashcards

Heart Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

The baroreceptors in the carotid and aortic bodies are sensitive to:

a. changes in arterial pressure
b. changes in carbon dioxide levels
c. changes in oxygen levels
d. changes in pH
e. all of these

A

a. changes in arterial pressure

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2
Q

Increases basic heart rhythm:

a. cardiac acceleratory center (CAC)
b. cardiac inhibitory center (CIC)
c. thoracic spinal nerve
d. vagus nerve

A

a. cardiac acceleratory center (CAC)

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3
Q

Decreases basic heart rhythm:

a. cardiac acceleratory center (CAC)
b. cardiac inhibitory center (CIC)
c. thoracic spinal nerve
d. vagus nerve

A

b. cardiac inhibitory center (CIC)

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4
Q

Takes message from CAC to heart:

a. cardiac acceleratory center (CAC)
b. cardiac inhibitory center (CIC)
c. thoracic spinal nerve
d. vagus nerve

A

c. thoracic spinal nerve

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5
Q

Takes message from CIC to heart:

a. cardiac acceleratory center (CAC)
b. cardiac inhibitory center (CIC)
c. thoracic spinal nerve
d. vagus nerve

A

d. vagus nerve

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6
Q

Where is the VMC located?

a. hypothalamus
b. cerebral cortex
c. heart
d. medulla oblongata
e. adrenal medulla

A

d. medulla oblongata

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7
Q

True or False:

During total diastole, blood is entering the heart.

A

True

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8
Q

Caffiene would ___ heart rate.

a. increase
b. decrease
c. have no effect on

A

a. increase

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9
Q

Area in the back wall of the right atrium:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

a. sinoatrial node

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10
Q

Area in the wall between the right atrium and the right ventricle:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

b. AV node

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11
Q

Area that is the only connection between the atria and the ventricles:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

c. AV bundle of HIS

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12
Q

Area in the interventricular septum to conduct the action potential to the bottom of the ventricles:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

d. bundle branches

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13
Q

Area that initiates heart contraction and sets the contraction pace:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

a. sinoatrial node

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14
Q

Area in the outer ventricular walls to conduct the action potential into the cardiac muscle:

a. sinoatrial node
b. AV node
c. AV bundle of HIS
d. bundle branches
e. Purkinje fibers

A

e. Purkinje fibers

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15
Q

Which of the following decrease heart rate?

a. nicotine
b. thyroxine
c. epinephrine
d. all of these
e. none of these

A

e. none of these

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16
Q

True or False:

The degree to which the cardiac muscle is stretched is called preload.

A

True

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17
Q

An EKG provides information about which of the following?

a. movement of depolarization across the heart
b. coronary circulation
c. valve impairment
d. cardiac output
e. none of these

A

a. movement of depolarization across the heart

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18
Q

When the semilunar valves are open, which of the following are occurring?

a. The ventricles are filling.
b. The AV valves are closed.
c. The atria are contracting.
d. The ventricles are in diastole.
e. All of these are occurring.

A

b. The AV valves are closed.

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19
Q

Which of the following would stimulate the heart to produce lactic acid?

a. rising levels of hydrogen ions
b. rising levels of calcium ions
c. lack of blood supply to cells
d. all of these
e. none of these

A

c. lack of blood supply to cells

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20
Q

When the semilunar valves are open, which of the following are occurring?

a. The ventricles are in systole.
b. Blood is entering the aorta.
c. Blood is entering the aorta arteries.
d. All three of these things are occurring.
e. None of these are occurring.

A

d. All three of these things are occurring.

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21
Q

Atrial depolarization:

a. P wave
b. T wave
c. QRS complex

A

a. P wave

22
Q

Ventricular depolarization:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

23
Q

Ventricular repolarization:

a. P wave
b. T wave
c. QRS complex

A

b. T wave

24
Q

Atrial repolarization:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

25
Q

Atria contract:

a. P wave
b. T wave
c. QRS complex

A

a. P wave

26
Q

Ventricles contract:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

27
Q

Ventricles relax:

a. P wave
b. T wave
c. QRS complex

A

b. T wave

28
Q

Atria relax:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

29
Q

Atrial systole:

a. P wave
b. T wave
c. QRS complex

A

a. P wave

30
Q

Ventricular systole:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

31
Q

Atrial diastole:

a. P wave
b. T wave
c. QRS complex

A

c. QRS complex

32
Q

Ventricular diastole:

a. P wave
b. T wave
c. QRS complex

A

b. T wave

33
Q

Increases in potassium would ___ heart rate.

a. increase
b. decrease
c. have no effect on

A

b. decrease

34
Q

True or False:

The most important factor stretching heart muscle is venous return.

A

True

35
Q

Entry leads to depolarization of cardiac muscle cells:

a. sodium ions
b. potassium ions
c. calcium ions

A

a. sodium ions

36
Q

Exit leads to relaxation of cardiac muscle cells:

a. sodium ions
b. potassium ions
c. calcium ions

A

b. potassium ions

37
Q

Entrance leads to a plateau or prolonged wave of depolarization of cardiac muscle cells:

a. sodium ions
b. potassium ions
c. calcium ions

A

c. calcium ions

38
Q

Cardiac cells do not contract, they initiate contraction of the cardiac contracting cells:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

a. autorhythmic

39
Q

Cardiac cells that set the pace for the heart beat:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

a. autorhythmic

40
Q

Ability of heart to set its own pace for contraction:

a. autorythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

b. intrinsic

41
Q

Rapid heart rate:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

c. tachycardia

42
Q

Slow heart rate:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

d. bradycardia

43
Q

Abnormal pacemaker:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

e. ectopic focus

44
Q

Damage to AV node that interferes with the ability of the ventricle to receive impulses:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

f. heart block

45
Q

Occurs when small area of the myocardium contract independently of each other instead of as a unit:

a. autorhythmic
b. intrinsic
c. tachycardia
d. bradycardia
e. ectopic focus
f. heart block
g. fibrillation

A

g. fibrillation

46
Q

Being angry or stressed would cause the VMC to do which of the following?

a. increase vasoconstriction
b. increase vasodilation

A

a. increase vasoconstriction

47
Q

True or False:

High levels of hydrogen would decrease heart contractility.

A

True

48
Q

True or False:

Isovolumetric relaxation occurs when both ventricles are totally closed and void of blood.

A

True

49
Q

If cardiac output stays constant, what effect would an increase in stroke volume have on heart rate?

a. an increase
b. a decrease
c. no effect

A

b. a decrease

50
Q

Which of the following does not correctly describe cardiac output?

a. It is the amount of blood pumped out of each ventricle each minute.
b. It is calculated by multiplying heart rate times stroke volume.
c. It stays constant at all times.
d. It has a resting value of 5.25 L/min.
e. All of these are correct.

A

c. It stays constant at all times.

51
Q

True or False:

The closing of the SL valves makes the first heart sound in the cardiac cycle,

A

False

Biology 202 (1 decks)

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