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ANATOMY > MUSCLE TISSUE (Lecture 6) > Flashcards

MUSCLE TISSUE (Lecture 6) Flashcards

1
Q

3 types of muscle

A

skeletal
cardiac
smooth

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2
Q

function of muscle fibers

A

produce force, contraction / movement, heat

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3
Q

muscle fibers are surrounded by __________ matrix

A

connective tissue matrix, bound by external lamina

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4
Q

sarcolemma aka ?

A

plasma membrane

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5
Q

sarcoplasm aka ?

A

cytoplasm

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6
Q

what causes contraction in muscle fibers

A

the interaction of cytoplasmic protein chains (myofilaments)

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7
Q

interactions of cytoplasmic protein chains are called?

A

myofilaments

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8
Q

what muscle cells are striated?

A

skeletal and cardiac

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9
Q

what muscle cells are non-striated?

A

smooth muscle

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10
Q

the cell diameter of a muscle cell is proportional to its _____ production

A

force production

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11
Q

skeletal muscle is usually attached to ____ or other muscles

A

bone

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12
Q

what are triads composed of and where are they located

A

triad = 2 terminal cisternae + 1 T tubule
located: junction of A and I bands

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13
Q

what is a motor unit composed of

A

motor neuron + muscle fibers it innervates

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14
Q

skeletal muscle has a rich blood supply that comes from _____?

A

surrounding connective tissue

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15
Q

term for a bundle of muscle fibers

A

Fascicle

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16
Q

term for single muscle fiber

A

myocyte

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17
Q

term for long rows of myofilaments

A

myofibrils

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18
Q

the dark bands are ____ bands

A

A

19
Q

the light bands are ____ bands

A

I

20
Q

the dark line in the I band is called the ____ disk/line

A

Z disk/line

21
Q

what causes striations in skeletal muscle

A

the overlapping myofilament arrangement

22
Q

a sarcomere is ?

A

smallest contractile unit

23
Q

a sarcomere spands from ____ disk to ___ disk

A

Z disk to Z disk

24
Q

An ‘I’ band is ______ myofilament

A

thin only

25
Q

An ‘H’ band is ____ myofilament

A

thick only

26
Q

muscle fiber aka _____ aka ______

A

muscle fiber = muscle cell = myocyte

27
Q

Skeletal muscle has an abundance of what

A
  • mitochondria
  • glycogen (E source inside muscles)
  • myoglobin (like hemoglobin but has more O2)
28
Q

sarcoplasmic reticulum (SR) aka

the muscle term for…

A

smooth ER

29
Q

what ion is needed for muscle contraction to occur

A

Calcium

30
Q

CT that surrounds muscle fibers

A

endomysium: made of type IV, III collagen

similar function to the basal lamina, reticular lamina

31
Q

CT that surrounds fascicles

A

perimysium: type I collagen

type I collagen
32
Q

CT that surrounds the entire muscle

A

Epimysium: type I collagen

33
Q

What is the sliding filament theory

A

the Z lines get closer together as the myofilaments slide past eachother

34
Q

what are t tubules (transverse tubules)

A

extensions of the sarcolemma

sarcolemma = muscular plasma membrane

35
Q

the sarcolemma of the myocyte has ______ folds and ______ receptors

A

junctional folds and ACh receptors

36
Q

explain why rigor mortis occurs

A

lack of ATP prevents the dissociation of action and myosin = no muscle movement

37
Q

where is smooth muscle found?

A
  • hollow organs, blood vessels, dermis, respiratory passages
38
Q

smooth muscle characteristics

A
  • often in perpendicular layers
  • produce their own “CT matrix”
    -fusiform shape
  • single and centrally located nucleus
  • not striated
  • NO t-tubules
  • barely any SR
  • have caveolae
39
Q

where does smooth muscle get a majority of its Calcium?

A

Ca2+ source is mainly extracellular

40
Q

role of caveolae in smooth muscle?

A

caveolae are membrane invaginations that facilitate the INTAKE of Ca2+

41
Q

type of muscle tissue that has a crisscross pattern of myofilaments

  • the crisscross pattern facilitates contraction of the fusiform shape
A

smooth muscle

42
Q

type of muscle tissue with a “corkscrew” nucleus

A

smooth muscle

43
Q

smooth muscle cells can be relaxed or _______

A

relaxed or contracted

ANATOMY (58 decks)

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