ms - vocab test 2 Flashcards

1
Q

contract to produce movement **unique

A

contractility

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2
Q

respond to stimuli

A

irritability

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3
Q

antagonistic relationship exists between muscle pairs, one contracts and the opposing muscle extends. (biceps & triceps)

A

extensibility

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4
Q

can return to their original shape when relaxed

A

elasticity

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5
Q

a. involuntary
b. found in the walls of organs
c. responsible for the movements that force food through the digestive tube
d. can remain contracted the longest

A

smooth muscle tissue

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6
Q

a. involuntary
b. some striations (stripes)
c. found only in the heart
d. does not fatigue (thank goodness! J )
e. contains intercalated discs

A

cardiac muscle tissue

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7
Q

a. has striations
b. voluntary: controlled consciously
c. attached to bones for movement of limbs
d. quickest response to stimuli
e. protective
f. quickest to fatigue

A

skeletal muscle tissue

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8
Q

move from one place to another, like walking

A

locomotion

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9
Q

connective tissue that covers and binds the muscle fiber (muscle cell)

A

endomysium

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10
Q

a covering of connective tissue that binds the muscle together in a big bundle

A

epimysium

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11
Q

connective tissue that covers and binds the fascicles

A

perimysium

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12
Q

bundles of muscle fibers

A

fascicles

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13
Q

separates muscles

A

tendons and fascia

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14
Q

muscle cell

A

muscle fiber =

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15
Q

1-2 microns in diameter these make up the striations or stripes; lie parallel to each other; extend the length of the fiber.

A

myofibrils

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16
Q

thin myofilament

A

actin (acTIN)

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17
Q

thick myofilament; actin and myosin overlap.

A

myosin

18
Q

organized structures in muscle cells that contain the proteins actin and myosin

A

myofilaments

19
Q

These myofilaments are arranged in repeated units called

A

sarcomere

20
Q

When a muscle contracts, the myosin and actin slide over each other, actin is attached to the z lines; they slide inward pulling the z lines toward each other then the muscle fibers contract.

A

sliding filament theory

21
Q

a. one muscle fiber is one muscle cell
b. it is the contractile unit of muscle
c. it is cylindrical and surrounded by a membrane called sarcolemma.

A

muscle fiber

22
Q

the plasma membrane of the muscle cell

A

sarcolemma

23
Q

contains many, many mitochondria and many myofibrils.

A

sarcoplasm

24
Q

a. Producing body movements
b. Stabilizing body positions
c. Regulating organ volume
d. Moving substances within the body
e. Produce heat

A

functions of muscles

25
Q

a system of channels and tubes that help in activating fiber contraction when nerves stimulate muscles to shorten.

A

sarcoplasmic reticulum

26
Q

a. the neuromuscular Junction
b. neurotransmitters
c. motor unit

A

parts that make muscles work

27
Q

the union between a motor neuron and a muscle fiber

A

the neuromuscular junction

28
Q

chemicals that diffuse across the gap between a motor neuron and a muscle fiber bringing stimuli to muscle fiber, contraction then occurs.

A

neurotransmitters

29
Q

all the muscle fibers associated with and stimulated by one motor neuron

A

motor unit

30
Q

the smaller the number of muscle fibers in a motor unit, the finer the movements (eyes and fingers)

A

fine motor function

31
Q

large number of muscle fibers in a motor unit produce strength or large movements, as in the leg

A

gross motor function

32
Q

creatine phosphate (CP)
anaerobic cellular respiration (w/o oxygen)
aerobic cellular respiration (w/oxygen)

A

provides ATP (adenosine triphosphate) for muscle energy

33
Q

break down carbohydrates for energy: build-up causes pain

A

lactic acid

34
Q

rigidity of death: calcium ions leak out of the sarcoplasm causing stiffness of muscles. It begins 3-4 hours after death, lasts about 24 hours and disappears as enzymes digest.

A

rigor mortis

35
Q

spasmodic, painful, involuntary muscle contractions, usually occur after exercise, during sleep. Painful because the muscle does not relax completely.

A

muscle cramps

36
Q

sustained tension in muscles, muscles are firm but do not contract: muscles in the back and neck hold up your head, keep posture

A

muscle tone (tonus)

37
Q

tightening, shortening, lengthening of muscles

A

muscle contraction

38
Q

increase in size of skeletal muscle cells (ex. lifting weights)

A

muscle hypertrophy

39
Q

decrease in size of skeletal muscle cells (ex. paralysis of limbs)

A

muscle atrophy

40
Q

small structures in a cell that are found in the cytoplasm (fluid that surrounds the cell nucleus)

A

mitochondria

41
Q

a series of wavelike muscle contractions that move food through the digestive tract

A

peristalsis