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Chapter 6 Human Anatomy > Chapter 20 The heart Lec2Exam > Flashcards

Chapter 20 The heart Lec2Exam Flashcards

1
Q

Which statement is true ?

A

If the pacemaker of the heart stops the AV node will take over

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2
Q

The left atrium receives blood from the pulmonary circuit and empties it into the

A

Left Ventricle

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3
Q

The “Double Pump” function of the heart include’s the right side, which serves the _____circuit pump, while the left side serves as the ____pump.

A

Pulmonary: Systemic

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4
Q

The coronary vessels emerge at the base of the:

A

Aorta

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5
Q

Which blood vessels are known as exchange vessels?

A

Capillaries

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6
Q

Blood from the coronary circuit is collected on the posterior aspect of the heart in a blood vessel known as :

A

Coronary sinus

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7
Q

During the action potential in a contractile cardiac muscle cell when slow calcium channels open this result in the____phase.

A

Plateau

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8
Q

When deoxygenated blood leave the right ventricle through a semilunar valve, it is forced into the:

A

Pulmonary arteries

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9
Q

The passageway between cardiac muscle cells that allow ions to pass freely are called:

A

Gap junctions

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10
Q

Which of the following are characteristic of cardiac muscle cell??

A

Striated, single central nucleus and involuntary.

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11
Q

Cardiac Muscle tissue?

A

Has its own intrinsic conduction system that can set the pace of the beating heart.

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12
Q

The RIGHT coronary artery generally gives rise to:

A

Both A and C are correct
The marginal branches
The posterior interventricular artery

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13
Q

The LEFT coronary artery supplies blood to:

A

Both B and C are correct
the anterior interventricular artery
the circumflex branch

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14
Q

The correct sequential path of a normal action potential in the heart is:

A

SA node, AV node, bundle of his, bundle branches, purkinje fibers

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15
Q

An above-normal increases in K+ concentrations in the blood would cause:

A

The heart to dilate and become flaccid and weak.

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16
Q

The P wave on ECG indicate :

A

The electrical events spreading out over both atria

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17
Q

After the AV node is depolarizing and the impulse spreads through the atria, there is a slight delay before the impulse spreads to the ventricles . The reason for this delay is to allow.

A

The atria to contract

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18
Q

If each heart muscle cell contracted at its own individual rate, the condition would resemble:

A

fibrillation

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19
Q

The QRS complex of the ECG appears as the:

A

Ventricles depolarize

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20
Q

When a chamber of the heart fills with blood and prepares for the start of the next cardiac cycle the heart is in

A

Diastole

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21
Q

During the isovolumetric concentration phase, the pressure in the __has to rise above aortic pressure for ventricular ejection to occur.

A

LEFT ventricle

22
Q

How would you define cardiac output?

A

the amount of blood pumped OUT of the LEFT ventricle in one minute

23
Q

The amount of blood pumped out of each ventricle during a single beat is the :

A

Stroke volume

24
Q

Under normal circumstances, the factor responsible for making delicate adjustments to the heart rate as circulatory demands change are:

A

Autonomic activity and circulatory hormones

25
Q

The cardiac centers in the medulla oblongata monitor baroreceptors and chemoreceptors innervarted by the:

A

Glossopharyngeal N IX and vagus N X

26
Q

The difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV) is the

A

Stroke volume

27
Q

Parasympathetic stimulation from the vagus nerve results in:

A

a decrease in heart rate

28
Q

Which of the following statements is part of starling’s law of the heart?

A

All of the above

A slightly larger and better contracting heart will increase stroke volume

29
Q

Physicians are interested in cardiac output because it provides a useful indication of :

A

Ventricular efficiency over time

30
Q

One of the major result of congestive heart failure is:

A

an abnormal increase in blood volume and interstitial fluid

31
Q

Which of the following medication serves as a positive ionotropic agent for treatment of congested heart failure?

A

Digitalis

32
Q

The function of the chordae tendinae is to:

A

Anchor the AV valve flaps and prevent backflow of blood into the atria.

33
Q

Which of the following would not show up on an electrocardiogram?

A

Murmurs

34
Q

During ventricular diastole, when the pressure in the left ventricle rises above that in the left atrium:

A

The LEFT AV valve closes

35
Q

During ventricular systole, the blood volume in the atria is ___, and the volume in the ventricle is:

A

increasing: decreasing

36
Q

Cardiac muscle cells are nourished via blood supply provided from the :

A

Coronary circuit

37
Q

Pulmonary arteries carry blood to the

A

LUNGS

38
Q

Which of the following statements is (are) true?

A

Statements c and d are true
During ventricular diastole, the ventricles are filling with blood
During ventricular systole the papillary muscles contract to snap the AV valves shut.

39
Q

The heart sound associated with 52 occurs after the ventricles__and the semilunar valves ___.

A

Contract; close

40
Q

During isovolumetric systole, pressure is highest in the :

A

left ventricle

41
Q

Blood pressure in the large systemic arteries is greatest during:

A

systolic ejection

42
Q

Decreased parasympathetic (vagus) stimulation to the heart result in a situation known as:

A

tachycardia

43
Q

Serious arrhythmias that reduce the pumping efficiency of the heart may indicate?

A

All of the above
Variation in the ionic composition of the extracellular fluids
injury to the SA and AV nodes
damage to the myocardium

44
Q

During exercise the most important control mechanism to increase cardiac output is:

A

increased sympathetic activity to the ventricles

45
Q

The diastole phase of the blood pressure relative to the left ventricle indicates that :

A

The ventricles are “resting”

46
Q

Which of the following does not control the movement of blood through the heart ?

A

size of the atria and ventricles

47
Q

Valvular malfunction in the heart :

A

Interferes with movement of blood through the heart

48
Q

If the bicuspid valve is defective and valvular regurgitation occurs the end result is:

A

an insufficient amount of blood is available to be moved into the aorta and systemic circulation

49
Q

Valvular stenosis refers to

A

excessive narrowing of a valve

50
Q

The blood vessel in the cardiovascular system are subdivided into three circuits know as the:

A

Coronary, pulmonary, and systemic circuits

Chapter 6 Human Anatomy (2 decks)

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