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Anatomy & Physiology Unit 2 > Muscles > Flashcards

Muscles Flashcards

1
Q

Bring action potential to interior of the cell (muscle)

A

T-Tubule

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2
Q

Contains sarcoplasmic reticulum and T-Tubule

A

Triad

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3
Q

Stores Ca+ ions

A

Sarcoplasmic recticulum

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4
Q

Contains bundles of fascicles, biggest unit

A

Whole muscle

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5
Q

CT membrane covering whole muscle

A

Epimysium

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6
Q

Bundle of muscle cell

A

Fascicle

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7
Q

CT membrane covering fascicle

A

Perimysium

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8
Q

Third largest structure (cells)

A

Muscle fibers

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9
Q

Outer covering of each muscle cell (fiber)

A

Endomysium

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10
Q

A myofiber is formed from several

A

Myofibrils

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11
Q

Whole muscle, fascicle, muscle cell, myofibrils, sarcomeres

A

Largest to smallest

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12
Q

Myofilaments, sarcomere, myofibril, myofiber, fascicle, whole muscle

A

Smallest to largest

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13
Q

Contains several sarcomeres

A

Myofibrils

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14
Q

Contractile unit on muscle floor

A

Sarcomere

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15
Q

Sarcomere shortens

A

Contracted myofiber

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16
Q

Initial state of myofiber

A

Rest

17
Q

Sarcomere lengthens

A

Relaxed myofiber

18
Q

In the H-zone (bare zone)

A

Myosin

19
Q

Secretes Ca+ ions

A

Sarcoplasmic reticulum

20
Q

Binds to a regulatory molecule (troponin)

A

Ca+

21
Q

Voluntary, excitable, multinucleated, striated, associated with skeleton, motor unit (one motor neuron and the number of skeletal muscle fibers it supplies)

A

Skeletal muscle

22
Q

Non-striated, involuntary, excitable, associated with internal organs and viscera (glands), single nucleus

A

Smooth muscle

23
Q

In heart

A

Cardiac muscle

24
Q

Cell membrane of a myofiber

A

Sarcolemma

25
Q

Removes myosin heads from actin

A

ATP

26
Q

One nerve cell and number of muscle cells it supplies

A

Motor unit

27
Q

NOT in sarcomere

A

X-region

28
Q

Non-striated

A

Smooth muscle

29
Q

Single cell

A

Endomysium

30
Q

Covers whole muscle

A

Epimysium

31
Q

Acts as a block/barricade to binding site

A

Tropomyosin

32
Q

Na+ binds to it, thumb tack like structures

A

Troponin

33
Q

Binds to actin, tropomyosin and troponin needs to be removed

A

Myosin

34
Q

Contains sarcomeres

A

Myofibril

35
Q

Moves/shifts

A

Actin

36
Q

Myofilament, myofibril, myofiber, fascicle, whole muscle

A

Smallest to largest

37
Q

Muscle cell

A

Myofiber

38
Q

Disappears when sarcomere narrows and muscle contracts

A

I band

39
Q

Myosin, in center of sarcomere

A

A band

Anatomy & Physiology Unit 2 (3 decks)

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