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biology > skeletal muscle > Flashcards

skeletal muscle Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

what are two pairs of muscle called

A

antagonist pair

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2
Q

what are the names of the two type of muscle in an antagonist pair

A

antagonist and agonist

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3
Q

what the name of the muscle that relaxes in the pair

A

antagonist

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4
Q

what is the name of the muscle that contracts in the pair

A

agonist

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5
Q

what are muscle fibres

A

long specialised cells

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6
Q

what is the sarcolemma

A

membrane of muscle fibres

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7
Q

what are t tubules

A

the inwards folds of the sarcolemma to the sarcoplasm

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8
Q

what is the sarcoplasmic reticulum

A

organelle in the sarcoplasm it stores calcium

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9
Q

what does the mitochondria provide in the muscle fibres

A

ATP to power muscle contraction

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10
Q

what are myofibrils

A

cylindrical organelles that run along the length of the muscle fibres they are the site of muscle contraction

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11
Q

what is the sarcomere

A

multiple units that run end to end along the myofibril

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12
Q

what is the end of the sarcomere called

A

the Z line

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13
Q

sarcomeres are made up of 2 types of what

A

myofilaments

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14
Q

what are the two types of myofilaments called

A

thick myofilaments and thin myofilaments

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15
Q

what is the purpose of myofilaments

A

they slide past each other which makes muscles contract

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16
Q

thick myofilaments are made up of what

A

myosin protein

17
Q

thin myofilaments are made up of what

A

actin protein

18
Q

what is the A band

A

the overlapping region where the thick myofilaments overlap with the thin myofilaments at each end

19
Q

what is the H zone

A

the region with only myosin filament

20
Q

thin actin filaments overlap with myosin filaments in the middle of the sarcomere what is this called

A

the M line

21
Q

what is the region with only actin filament called

A

the I band

biology (7 decks)

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