Chapter 20: The Heart Flashcards Preview

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Flashcards in Chapter 20: The Heart Deck (55)
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1

the blood vessels in the cardiovascular system are subdivided into the...

pulmonary and systemic circuits

2

blood is carried away from the heart in...

arteries

3

the left atrium recieves blood from the pulmonary circuit and empties it into the...

left venticle

4

the "double pump" function of the heart includes the right side, which serve as the ________ circuit pump, while the left side serves as the _______ pump.

pulmonary; systemic

5

the major difference between the left and right ventricles relative to their role in heart function is...

the LV pumps blood through the high-resistance systemic circulation

6

the great cardiac vein drains blood from the heart muscle to the...

right atrium

7

the visceral pericardium, or epicardium, covers the...

outer surface of the heart

8

the valves of the heart are covered by the squamous epithelium, the...

endocardium

9

the three distinct layers of the heart wall include the...

epicardium, myocardium, and endocardium

10

atrioventricular valves prevent backflow of blood into the_______; semilunar valves prevent backflow into the________.

atria; ventricles

11

blood flows from the left atrium into the left ventricle through the __________ valve.

1. bicuspid
2. L atrioventricular
3. mitral

12

when deoxygenated blood leaves the right ventricle through a semilunar valve, it is forced into the...

pulmonary arteries

13

blood from systemic circulation is returned to the right atrium by the....

superior and inferior vena cava

14

oxygenated blood from the systemic arteries flows into...

peripheral tissue capillaries

15

the lung capillaries recieve deoxygenated blood from the....

pulmonary arteries

16

one of the important differences between skeletal muscles tissue and cardiac muscle tissue is that cardiac muscle tissue is...

striated involuntary muscle

17

cardiac muscle tissue...

does not require nerve activity to stimulate a contraction

18

the primary difference that characterize cardiac muscle cells when comparing them to skeletal muscle fibers is...

1.small size
2.a single, centrally located nucleus
3. the presence of intercalated discs

19

blood from coronary circulation is returned to the right atrium of the heart via...

the coronary sinus

20

the right coronary artery supplies blood to...

1. the right atrium
2. portions of the conducting system of the heart
3. portions of the right and left ventricles

21

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

SA node->AV node->AV bundle->bundle braches->Purkinje fibers

22

if the papillary muscles fail to contract, the...

AV valves will not close properly

23

the sinoartrial nodes acts as the pacemaker of the heart because these cells are...

the ones that depolarize and reach threshold first

24

after the SA node is depolarized and the impulse spread through the atria, there is a slight delay before the impulse spreads to the ventricles. The importance of this delay is that it allows...

the atria to finish contracting

25

if each heart muscle cell contracted at its own individual rate, the condition would resemble...

fibrillation

26

the P wave of a normal electrocardiogram indicates...

atrial depolarization

27

the QRS complex of the ECG appears as the...

ventricles depolarize

28

ECGs are useful in detecting and diagnosing abnormal patterns of cardiac activity called...

cardiac arrhythmias

29

an excessively large QRS complex often indicates that the...

heart has become enlarged

30

the events between the start of one heartbeat and the start of the next are called the...

cardiac cycle