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Biology > muscles > Flashcards

muscles Flashcards

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0
Q

where are muscles not located?

A

in porifera

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1
Q

where were muscles first found?

A

in annelids

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2
Q

what makes muscles work?

A

contracting and relaxing

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3
Q

what shape are cells in muscles?

A

cylindrical

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4
Q

what are the basic animal tissues?

A

smooth muscle cardiac, striated

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5
Q

what are characteristics of smooth muscles?

A

no striations one cell with one nucleus

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6
Q

what does visceral mean ?

A

guts

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7
Q

are muscle fibers tightly packed ?

A

yes

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8
Q

what are characteristics of the heart muscle?

A

involuntary, small short fibers, striation and uninucleate, intercalated disks

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9
Q

what is the most common type of muscle?

A

striated

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10
Q

what are muscles made of ?

A

bundles of muscle fibers

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11
Q

what are your muscle cells made of ?

A

myofibrils

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12
Q

what two proteins make up myofibril?

A

actin and myosin

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13
Q

what are actin and myosin?

A

proteins that make up myofibrils actin is a thin filliment and myosin is a thick filiment

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14
Q

what is a z line?

A

a vertical line that holds the actin filaments

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15
Q

what makes thin filaments

A

two strands of actin and other protein

16
Q

what makes thick filaments?

A

myosin

17
Q

what is the sliding filament theory of muscle contraction?

A

when contraction occurs the z lines move to the center of the srcomere which leads to much more overlap and the light areas will be much smaller.

18
Q

what is the sliding filament theory of muscle contraction with thick filaments (myosin)

A

composed of 200 myosin molecules that have tails and heads. the heads have atp,.

19
Q

what is the sliding filament theory of muscle contraction with thin filaments (actin)

A

mostly composed of actin, the troponin and tropomyosin are going to cover up the spots where the myosin heads would bind

20
Q

what is the arrangement of sarcoplasmic reticulum?

A

each myofibril has a sarcoplasmic reticulum there has to be an axon that sends a signal to allow the myofibrils to be able to contract

Biology (6 decks)

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