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Human Lab > Lab 8 > Flashcards

Lab 8 Flashcards

1
Q

Functional syncytium of muscle fibers, and the individual cells are electrically coupled

A

Cardiac Muscle

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2
Q

Impulse in a cardiac muscle is

A

all or none

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3
Q

the cardiac muscle contract more forcefully when stretched within limits

A

Starling’s law

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4
Q

cardiac muscle is made up of bulk of

A

myocardium

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5
Q

cells that contract without external stimulus

A

autorhythmic

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6
Q

the rate at which a heart beat is determined by what part of the heart? located at the rear of the heart

A

SA node

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7
Q

normal heart beat

A

70-75 times/minute

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8
Q

factors that influence the cardiac muscle contraction

A

nervous input, chemical & metabolic change, temperature

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9
Q

coordination of heart beat is due to the specialized conduction pathways located where?

A

in and between the atria and the ventricle

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10
Q

one feature of the path

A

delay of the AV node

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11
Q

allows the atria to complete their contraction before the ventricles begin to contract

A

delay of the AV node

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12
Q

(pacemaker) due to changes in the membrane channel conductances of

A

K, Ca, Na

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13
Q

ionic fluzes are modified by autonomic inputs, rate and force of contraction of heart can be

A

increase, decrease

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14
Q

frog heart has ___ chambered

A

3 (2 atria and 1 ventricle)

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15
Q

human heart has ____chambers

A

4 (2 A and 2 V)

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16
Q

where deoxygenated blood arrives

A

RA

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17
Q

where oxygenated blood arrives

A

LA

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18
Q

after passing in the atrium it goes to the

A

Ventricles

19
Q

During ventricular systole the blood leaves through what?

A

truncus arteriosus

20
Q

this prevents the mixing of deoxy and oxygenated blood

A

truncus arteriosus

21
Q

heart is enclosed by

A

pericardium

22
Q

ion that play important tole in excitation contraction coupling sequence

A

Ca

23
Q

the excitation starts from __ to ___

A

atria to AV node

24
Q

where electrical impulses travel

A

bundle of His and purkinje fibers

25
Q

condition when the wave of excitation-contraction E-C can not proceed because of infarct or mechanical obstruction

A

heart block

26
Q

atria is dependent on ventricle

A

true

27
Q

cardiac influence extrinsic and intrinsic factors

A

neural hormonal. chemical, physical etc

28
Q

change in heart rate can be applied by adding para and sympa stimuli

A

chronotropic effect

29
Q

speed up the heart

A

epinephrine and norepinephrine

30
Q

slows down the heart

A

acetylcholine

31
Q

flow that keeps the pace of the heart..under the control via

A

tonic parasympathetic

vegal tone

32
Q

this effects can also be seen after administration of drug, including receptors, or channels or blockers

A

chronotropic effects

33
Q

use as a beta blocker, decreases heart rate

A

propanolol

34
Q

induces faster heart rate by blocking muscarinic type of acetylcholine receptors

A

atropine

35
Q

change in force, positive or negative, observed by altering the degree of stretch of the cardiac muscle fibers

A

inotropic effect

36
Q

stretching the heart can achieved by

A

filling the heart more with blood during diastole

37
Q

more Ca means

A

more availability of greater force

38
Q

effect when epinephrine and norepinephrine are applied

A

inotropic effect

39
Q

channel blockers used to decrease the force generated by the heart

A

Ca channel blockers

40
Q

increase the chart speed and make a record of several bears

A

contractile sequence

41
Q

recorded ventricular contractions under normal condition and effects of chemicals when applied

A

ventricular contraction

42
Q

effects on the heart rate

A

chronotropic

43
Q

effects on the force of contraction

A

inotropic

44
Q

length of the cardiac fiber can be changed by

A

adjusting the tension

Human Lab (12 decks)

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