Chapter 9/ Muscle Physiology Flashcards

1
Q

Skeletal
cardiac
smooth

A

muscle tissue

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2
Q

Has myofibrils and sarcomeres

A

skeletal muscle

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3
Q

Has special structures called transverse tubules

A

skeletal muscle

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4
Q

-Contain many mitochondria
-Multinucleated

A

skeletal muscle cell

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5
Q

Sarcolemma

A

Plasma membrane

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6
Q

Sarcoplasm

A

Cytoplasm

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7
Q

Sarcoplasmic reticulum

A

Smooth ER

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8
Q

-Transverse tubules
-sarcoplasmic reticulum
-myofibrils
-cytosol
-plasma membrane
-mitocondria
-terminal cisternae
-opening of transverse tubule to extracellular fluid

A

structure of a muscle fiber

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9
Q

Give skeletal
muscle striated
appearance
(skeletal muscle )

A

Myofibrils

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10
Q

Orderly
arrangement of
thick and thin
filaments
(skeletal muscle)

A

myofibrils-

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11
Q

Composed almost entirely of myosin proteins

A

Thick filamant

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12
Q

Two large polypeptide chains

A

Myosin

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13
Q

Two globular heads and two intertwined tails

A

Myosin

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14
Q

-Globular heads extend out, form cross bridges
– Globular heads contain binding sites for actin and
ATP

A

Myosin

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15
Q

Primarily composed of actin
(Also, troponin and tropomyosin)

A

thin filament

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16
Q

-Each G actin subunit has a binding site for myosin
-Form polymers of two intertwined, helical chains.
(thin filament)

17
Q

– Regulatory protein
– Overlaps binding sites on actin for myosin, inhibits
interaction when muscle fiber is relaxed
(thin filament)

A

tropomyosin

18
Q

– Regulatory protein
– Forms complex with actin and tropomyosin
(thin filament)

19
Q

– Reversibly binds Ca2+
– When Ca2+ is bound troponin changes
conformation to pull tropomyosin away from the myosin binding sites
(thin filament)

20
Q

spring-like protein, prevents overstretching

21
Q

Homologous to endoplasmic reticulum

A

sarcoplasmic reticulum

22
Q

Stores and releases Ca2+ following membrane
excitation

A

sarcoplasmic reticulum

23
Q

deep invaginations of the
sarcolemma

24
Q

Connected to sarcoplasmic reticulum

25
One motor neuron + all skeletal muscle fibers it innervates
motor units
26
Muscle fibers are innervated by only one
motor neuron
27
Many motor units within a whole
muscle organ
28
Skeletal muscle is under voluntary/unvoluntary control
voluntary
29
Stimulation by motor neurons is the only mechanism by which action potentials are initiated in
skeletal muscle
30
Axons of motor neurons are myelinated and are BLANK -diameter axons in the body
diameter
31
Propagate action potentials at BLANK velocity
high
32
The axon terminal of a motor neurons release (ACH)
acetylcholine
33