Muscular System Flashcards

1
Q

which kind of muscles have to have nerves to contract

A

skeletal muscles

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2
Q

which cell has the stimulus

A

each cell needs its own stimulus

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3
Q

what is each cell covered by?

A

connective tissue

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4
Q

what is the aponeuroses

A

a band of fasica, found on flat muscle. ex: epicranius

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5
Q

what is a tendon

A

its an extension of fascia, attaching bone to muscle

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6
Q

what is a epimysium

A

its located under the fascia and it covers the muscle but doesn’t extend past the muscle

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7
Q

what is the perimysium

A

covers each individual cell

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8
Q

where is the endomysium found

A

the surface of every cell

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9
Q

what is a fascicle made of and what is it covered by

A

it is made of muscle cells and covered by the perimysium

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10
Q

which is larger; a filament or a myofibril

A

myofibril

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11
Q

how many myofibrils is one cell made of

A

thousands

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12
Q

what is a sacrolemma

A

a term for cell membrane of a skeletal cell

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13
Q

whats the smallest unit of contraction

A

sacromere

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14
Q

does each cell have one nucleus

A

each cell has more than one nucleus

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15
Q

what is a striation

A

characteristic of skeletal and cardiac muscles; it is an arrangement of filaments

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16
Q

what is a fascicle

A

a collection of cells

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17
Q

what is a sarcomere

A

area of one z-line to the next

18
Q

what happens when a muscle contracts

A

the z line moves towards each other; meaning the I band disappears

19
Q

what does the A band consist of

A

only myosin

20
Q

whats the I ban consist of

A

only actin

21
Q

whats one thing that has to happen for a muscle to contract

A

the myosin has to bind to actin

22
Q

what is a protein complex

A

two proteins working together

23
Q

where are the binding sites located

A

on the actin

24
Q

what does a triad consist of

A

transverse tubule, terminal cisternae, and sacromere

25
Q

what’s the purpose of the sarcoplasmic reticulum?

A

envelop the myofibrils

26
Q

what is the terminal cisternae

A

where calcium is stored

27
Q

what do the transverse tubules connect to

A

the cell membrane

28
Q

what is a motor unit

A

a motor nerve and all the individual cells it controls

29
Q

what is a neuromuscular junction

A

place where a nerve communicates with a muscle

30
Q

what type of muscle has to have a message in order to contract

A

skeletal muscle

31
Q

what is acetylcholine

A

its a type of neurotransmitter, that eventually gets wiped out by an enzyme

32
Q

what is acetylcholinesterase

A

the enzyme that removes acetylcholine

33
Q

what is the motor end plate

A

the only place where sodium ligand-gated channels are; the only place where the nerve can talk to the muscle

34
Q

with the sliding filament model, do myofibrils change in length or do the filaments change in length

A

the myofibrils change in length; the z lines come closer, therefore each sarcomere becomes shorter

35
Q

why are the orientation of the heads on the myosin important

A

its important because of the way the heads are determine which direction it pulls; facing to the left then they are pulling to the right

36
Q

what happens when you reach the axon terminal

A

the voltage gated ion channels open

37
Q

what does calcium bind to

A

troponin

38
Q

what happens after the calcium binds to the troponin

A

it causes troponin and tropomyosin shift and exposes the binding sites, then the myosin can attach to the actin

39
Q

why does calcium exit the cell in the transverse tubule?

A

because of the gradient

40
Q

whats the purpose of the transverse tubule

A

to carry impulse deep into interior