chapter 9 part 1 Flashcards

1
Q

smooth muscle

A

-involuntary
-pushes fluid through the digestive tract and the urinary tract (from kidney to bladder)

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2
Q

properties of muscle tissue

A

-excitablility
-contractibility
-extensibility
-elasticity

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3
Q

excitability

A

response to stimuli

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4
Q

extensibility

A

contract with resting

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5
Q

skeletal muscle

A

-voluntary
-causes movement by pulling tendons
-posture
-support
-regulation (pee and vomit)
-BODY TEMP

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6
Q

microscopic muscle anatomy

A

microfibrils, myofilaments, sacromeres

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7
Q

epimysium

A

tissue around entire muscle
-it is a connective tissue

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8
Q

perimysium

A

tissue dividing muscle into fascicles (fiber bundles)

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9
Q

fascicle

A

fiber bundle

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10
Q

endomyseum

A

tissue surrounding individual fiber
-has blood vessels that make coiled networks that are used for flexion and extension

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11
Q

tendons

A

connect muscle and bone

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12
Q

aponeuroses

A

connect muscle to muscle

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13
Q

motor end plate

A

neuromuscular junction
-where the nerve and muscle meet

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14
Q

sarcolemma

A

plasma membrane of muscle fiber (has nucleus!!!)

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15
Q

sarcoplasm

A

cytosol of muscle cell (where the myofibrils are!!!!!!)

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16
Q

myoblasts

A

they fuse and become immature fiber that will later become a myosatellite cell

17
Q

myosatellite

A

repairs damaged muscle

18
Q

myofibrils cause?

A

muscle contractions

19
Q

myofibrils are located on?

A

the ends of muscle on sarcolemma

20
Q

myofibrils are surrounded by?

A

sarcoplasmic reticulum

21
Q

sarcoplasmic reticulum

A

-filled w calcium
-part of excitation/ contraction

22
Q

what are myofibrils made of?

A

myofilaments

23
Q

what are myofilaments made of?

A

actin (thin) and myosin (thick)

24
Q

myofilaments

A

runs parallel to long axis of the cell

25
Q

myosin and actin

A

are arranged in sacromeres

26
Q

sacromere

A

functioning unit of muscle cell
-their A bands overlapping is what causes striations

27
Q

actin

A

-filaments do not touch
-made of g actin molecules
-bind with myosin cross bridges
-binding sites are covered by tropomyosin when RELAXED
-tropomyosin is held in place by troponin

28
Q

troponin

A

needs to bind with calcium to move and expose tropomyosin/ active site

29
Q

organizational order

A

fascicle -> fiber -> myofibril -> myofilament -> actin and myosin

30
Q

myosin

A

-made of elongated tail and globular head
-STATIONARY molecule
-protein forms M line
-core of tinin connects z line
both hold it in place as stationary
-the head binds to the active site of actin and pulls so the head will bend
-need calcium ions and ATP for contraction

31
Q

contraction

A

-muscles get shorter
-H and L bands get smaller
-sliding filament theory