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Boards pt1 > Muscle physiology > Flashcards

Muscle physiology Flashcards

1
Q

cell membrane found in skeletal and cardiac muscle

A

sarcolemma

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2
Q

where ca2+ is stored to be released into skeletal muscle

A

sarcoplasmic reticulum

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3
Q

communication line that sends ap to release ca2+ from sarcoplasmic reticulum

A

t-tubules

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4
Q

two types of myofibril

A

actin and myosin

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5
Q

ratio of actin to myosin

A

2:1

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6
Q

myosin characteristics

A

thick, H-zone, cross bridges

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7
Q

what attaches to the myosin head

A

ATPase

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8
Q

actin characteristics

A

thin, f-actin filament + tropomyosin + troponin (i-bands)

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9
Q

what contains the binding sites in actin

A

f-actin filament

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10
Q

what covers f-actin binding sites

A

tropomyoisin

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11
Q

what binds ca2+ and moves tropomyosin

A

troponin

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12
Q

what does smooth muscle consist of

A

actin, myosin and sarcoplasmic reticulum

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13
Q

what is needed for smooth muscle contraction

A

calmodulin

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14
Q

actin/myoisin/SR location

A

smooth and skeletal

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15
Q

troponin/tropomyosin location

A

skeletal and cardiac

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16
Q

where are spindle organs

A

skeletal

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17
Q

z line to z line

18
Q

contains both actin and myosin

19
Q

has myosin only

20
Q

has actin only

21
Q

which band is smaller

22
Q

which band does not change shape

23
Q

what causes muscle fatigue

A

increased k ions

24
Q

muscle lengthens while it contracts is

25
Q

muscle shortens while it contracts is

A

concentric

26
Q

muscle contracts without joint movement or muscle lengthening

27
Q

muscle contracts with joint movement and constant weight

28
Q

muscle contracts with joint movement and constant weight/speed

A

isokinetic

29
Q

single motor neuron and all the muscle fiber it innervates

A

motor unit

30
Q

what do fast-twitch muscle fibers do

A

split ATP rapidly

31
Q

what are the ventral root fibers

A

alpha and gamma

32
Q

extrafusal fibers are

33
Q

intrafusal fibers are

34
Q

what determines strength of muscle

A

of muscle fibers recruited

35
Q

ascites is

A

abdominal swelling

36
Q

where are fats digested

37
Q

whole body edema is

38
Q

high CPK, ATPase activity increased is which muscle type

A

white (fast twitch)

39
Q

low CPK, low ATPas activity is which muscle type

A

red (slow twitch)

40
Q

what part of the kidney is impermeable to water

A

ascending loop of henle

Boards pt1 (28 decks)

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