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Anatomy and Physiology > Muscular system > Flashcards

Muscular system Flashcards

1
Q

A band

A

Middle band

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2
Q

I band

A

Between A band and M line

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3
Q

M line

A

Outer band

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4
Q

Myosin

A

Thick filament

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5
Q

Actin

A

Small, short horizontal bands

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6
Q

Z line

A

Zig zag lines lateral to h zone

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7
Q

H zone

A

small vertical bands in middle of fiber

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8
Q

Thick filament name

A

Myosin

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9
Q

Thin filament name

A

Actin

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9
Q

Actin binding site

A

Bulb on myosin

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10
Q

Tail

A

Extension of head

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11
Q

Tropomyosin

A

Cord on actin

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12
Q

Troponin

A

Small molecules

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12
Q

Troponin

A

Small molecules

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13
Q

What are the coupled proteins of muscles?

A

Actin and Myosin

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14
Q

What are the 2 movements of muscles?

A

Contracting and relaxing

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15
Q

What are the 3 types of muscles?

A

Skeletal, smooth, and cardiac

16
Q

How many muscles are there in the body?

A

639

17
Q

Each muscle has what 3 structures?

A

Artery, nerve, vein

18
Q

What is a muscle fiber? Where is it found? What is its purpose? What parts/organelles are involved?

A

Muscle cell, muscles, contract/relax, tropomyosin, troponin

19
Q

What is a fascicle? Where is it located?

A

Band of muscle fibers, muscle

20
Q

What are muscles made of?

A

Fascicles

21
Q

What are the 3 connective tissue sheets? Where are they located?

A

Epimysium (outside), perimysium (outside fascicles), endomysium (inside fascicles)

22
Q

Proteins change shape after ___________

A

binding

23
Q

Changing shapes allows proteins to ________/__________ with other stuff

A

bind/unbind

24
Q

What is a sarcomere? What proteins do they have?

A

Segment of muscle fiber, actin and myosin

25
Q

Actin is a ______ fiber

A

Thin

26
Q

Myosin is a ______ fiber

A

Thick

27
Q

What does the z line do?

A

Defines border of filaments

28
Q

What blocks the binding site on the actin filament?

A

Tropomysin and troponin

29
Q

What role does the multiple nuclei serve the muscle fiber?

A

More mitochondria

30
Q

What is the homologous structure for the endoplasmic reticulum, and what purpose does it have?

A

Sarcoplasmic reticulum, handles Ca++ to contract

31
Q

T Tubule purpose

A

Triggers movement by opening calcium channel

32
Q

What part of the actin filament does calcium bind to? What was blocking the binding site?

A

Troponin, actin, tropomyocin

33
Q

What molecule does myosin head bind to to become active?

A

ATP

34
Q

Sliding filament model

A

Myosin binds to ATP, myosin head extends and binds to actin and contracts

35
Q

How many ATPs are needed for each myosin head

A

1

36
Q

What is a cross bridge?

A

Where myosin and actin attach

37
Q

What is a power stroke?

A

Step after cross bridge causing release of energy

38
Q

Why do you need calcium for muscle contraction?

A

Allows actin and myosin to interact

Anatomy and Physiology (9 decks)

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