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Skeletal Muscle and Function > Skeletal Muscle and Structure > Flashcards

Skeletal Muscle and Structure Flashcards

1
Q

skeletal muscle is just one of the 3 types of muscle in body. what are the others

A

cardiac muscle
smooth muscle
skeletal muscle

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2
Q

which muscle types are striated (stripy appearance)

A

cardiac muscle

skeletal muscle - striated due to alternation of thick and thin filaments

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3
Q

skeletal muscle is always attached to..

A

a tendon- because it causes movement

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4
Q

name of the outer connective tissue layer around the skeletal muscle

A

epimysium (outer layer)

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5
Q

what is the muscle fascicile

A

structure where the muscle cells are in a bundle

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6
Q

what is the connective tissue layer around the muscle fascicle

A

perimysium

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7
Q

what is the name of layer around each muscle fibre/ cell

A

endomysium (inner layer)

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8
Q

skeletal muscle fibres are highly vascularised due to which blood vessel

A

capillaries that form a network

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9
Q

skeletal muscles are multi-nucleated. where are the nuclei positioned

A

on peripheries/ outer part

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10
Q

there is 1 nucleus every ____ sarcomeres

A

every 15 sarcomeres

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11
Q

why are muscle fibres multi-nucleated

A

proliferating myoblasts fuse into muscle fibres multiple times

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12
Q

what are satellite cells

A

cells for growth and regeneration

they divide into more proliferating myoblasts to repair skeletal muscle and more satellite cells

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13
Q

where are satellite cells found

A

under the base of lamina

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14
Q

90% of the skeletal muscle is myofibrils. what are myofibrils

A

longitudinal contractile cell unit composed of sarcomeres arranged in series

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15
Q

what is a length of full sarcomere indicated by

A

one z-disk to another z-disk= 1 sarcomere

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16
Q

A band contains

A

actin and myosin overlap

17
Q

I band contains

A

actin only

18
Q

the z-disk runs …

A

through the middle of the I-band

19
Q

what is the H zone

A

only myosin- no actin

20
Q

where is the H-zone

A

a darker band in the centre of the A band

21
Q

what happens to the I band during muscle contraction

A

width of I band decreases

22
Q

what happens to the A band during muscle contraction

A

stays the same

23
Q

what happens during muscle contraction

A

the filaments SLIDE PAST each other

24
Q

what is a myosin crossbridge

A

projections from the thick filament

- 6 thin surround 1 thick filament

25
Q

what is thick filament

A

myosin

26
Q

what is thin filament

A

actin

Skeletal Muscle and Function (5 decks)

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