ch 10 - lecture review Flashcards

1
Q

epimysium

A

layer of collagen fibers that surrounds entire muscle and separates it from surrounding to tissues

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2
Q

perimysium

A

surrounds fascicles

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3
Q

endomysium

A

surrounds individual muscle cells

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4
Q

what is the organization of a muscle tissue

A

Myofilament
Myofibril
Muscle fiber
Fasicle
Muscle tissue

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5
Q

myofilament

A

bundles of contractile protein filaments

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6
Q

myofibril

A

collections of myofilaments that are responsible for muscle contraction

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7
Q

muscle fiber

A

muscle cell

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8
Q

fascicle

A

bundle of muscle fiber

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9
Q

muscle tissue

A
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10
Q

2 types of myofilament

A

actin (thin) and myosin (thick)

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11
Q

sarcolemma

A

plasma membrane of a muscle fiber

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12
Q

sarcoplasm

A

cytoplasm of a muscle fiber

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13
Q

transverse tubules (t-tubules)

A

narrow tubes continuous with the sarcolemma, which extend from the surface of the muscle fiber deep into the sarcoplasm

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14
Q

sarcomere

A

repeating structural and functional units of a myofibril

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15
Q

sarcoplasmic reticulum

A

tubular network similar to smooth ER that surrounds each myofibril and forms terminal cisternae

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16
Q

terminal cisternae

A

store calcium and attach to T tubules

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17
Q

triad

A

2 cisternae plus a T tubule

18
Q

A bands

A

dark bands, which run the length of the thick filaments

19
Q

subdivisions of A band

A

M line
H band
zone of overlap

20
Q

M line

A

vertical line in center of A band; contains proteins that stabilize the position of the thick filaments

21
Q

H band

A

made only of thick filaments and extends on either side of the M line

22
Q

I band

A

light bands that contain only thin filaments

23
Q

which segments in a sarcomere, shorten during contraction?

A

H and I bands

24
Q

the 4 different types of protein that make up a myofibril.

A

Actin
Myosin
Tropomyosin
troponin

25
Which protein does the myosin head bind to during contraction?
actin
26
which ion helps in contraction process
calcium
27
sliding filament theory
during a contraction, thin filaments slide toward the center of the sarcomere (M line) alongside the thick filaments
28
Excitation- Contraction coupling?
the link between the generation of an action potential in the sarcolemma and the start of muscle contraction
29
neuromuscular junction
the synapse between a motor neuron and a skeletal muscle fiber
30
parts of nmj
axon terminal: expanded end of the axons of the motor neuron motor end plate: folded membrane of the skeletal muscle fiber at the NMJ synaptic cleft: space between the axon terminal and motor end plate
31
motor unit
a motor neuron and all the muscle fibers it controls
32
thin filament contain
- filamentous actin (f-actin) - nebulin - tropomyosin - troponin
33
filamentous actin (f-actin)
twisted strand composed of 2 rows of G-actin molecules
34
active sites on G-actin bind to
myosin
35
nebulin
holds the F actin strands together
36
tropomyosin
covers the active sites on G-actin and prevents actin-myosin interaction
37
troponin
globular protein that holds tropomyosin in place and binds to calcium ions
38
contraction steps (6)
1. brain stimulates muscle contraction + releases action potential 2. terminal cisternae releases Ca to bind to troponin 3. troponin becomes flat when Ca binds 4. tropomyosin slips off which exposes active sites on G-actin 5. myosin heads binds to exposed active sites 6. power stroke/musclencontracts
39
Tendon
Bone to muscle
40
aponeurosis
blending of epi, peri, and endomysium that forms a broad sheet at the end of a muscle
41
thin filament consists of
pair of F actin molecules twisted together