Chapter 20 The heart Lec2Exam

Question 1

Which statement is true ?

Answer 1

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

Question 2

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

Answer 2

Left Ventricle

Question 3

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.

Answer 3

Pulmonary: Systemic

Question 4

The coronary vessels emerge at the base of the:

Answer 4

Aorta

Question 5

Which blood vessels are known as exchange vessels?

Answer 5

Capillaries

Question 6

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

Answer 6

Coronary sinus

Question 7

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

Answer 7

Plateau

Question 8

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

Answer 8

Pulmonary arteries

Question 9

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

Answer 9

Gap junctions

Question 10

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

Answer 10

Striated, single central nucleus and involuntary.

Question 11

Cardiac Muscle tissue?

Answer 11

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

Question 12

The RIGHT coronary artery generally gives rise to:

Answer 12

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

Question 13

The LEFT coronary artery supplies blood to:

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

The heart to dilate and become flaccid and weak.

Question 16

The P wave on ECG indicate :

Answer 16

The electrical events spreading out over both atria

Question 17

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.

Answer 17

The atria to contract

Question 18

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

Answer 18

fibrillation

Question 19

The QRS complex of the ECG appears as the:

Answer 19

Ventricles depolarize

Question 20

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

Answer 20

Diastole

Question 21

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

Answer 21

LEFT ventricle

Question 22

How would you define cardiac output?

Answer 22

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

Question 23

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

Answer 23

Stroke volume

Question 24

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

Answer 24

Autonomic activity and circulatory hormones

Question 25

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

Answer 25

Glossopharyngeal N IX and vagus N X

Question 26

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

Answer 26

Stroke volume

Question 27

Parasympathetic stimulation from the vagus nerve results in:

Answer 27

a decrease in heart rate

Question 28

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

Answer 28

All of the above | A slightly larger and better contracting heart will increase stroke volume

Question 29

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

Answer 29

Ventricular efficiency over time

Question 30

One of the major result of congestive heart failure is:

Answer 30

an abnormal increase in blood volume and interstitial fluid

Question 31

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

Answer 31

Digitalis

Question 32

The function of the chordae tendinae is to:

Answer 32

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

Question 33

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

Answer 33

Murmurs

Question 34

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

Answer 34

The LEFT AV valve closes

Question 35

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

Answer 35

increasing: decreasing

Question 36

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

Answer 36

Coronary circuit

Question 37

Pulmonary arteries carry blood to the

Answer 37

LUNGS

Question 38

Which of the following statements is (are) true?

Answer 38

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.

Question 39

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

Answer 39

Contract; close

Question 40

During isovolumetric systole, pressure is highest in the :

Answer 40

left ventricle

Question 41

Blood pressure in the large systemic arteries is greatest during:

Answer 41

systolic ejection

Question 42

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

Answer 42

tachycardia

Question 43

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

Answer 43

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

Question 44

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

Answer 44

increased sympathetic activity to the ventricles

Question 45

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

Answer 45

The ventricles are "resting"

Question 46

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

Answer 46

size of the atria and ventricles

Question 47

Valvular malfunction in the heart :

Answer 47

Interferes with movement of blood through the heart

Question 48

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

Answer 48

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

Question 49

Valvular stenosis refers to

Answer 49

excessive narrowing of a valve

Question 50

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

Answer 50

Coronary, pulmonary, and systemic circuits