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Micro Anatomy and Histology > Muscle and Cardiology > Flashcards

Muscle and Cardiology Flashcards

1
Q

What is the sarcolemma?

A

the plasmalemma of the muscle cell

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2
Q

What is the sarcoplasm?

A

the cytoplasm of the muscle cell

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3
Q

What is the sarcoplasm reticulum?

A

the smooth ER of a muscle cell

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4
Q

What is a myofibril?

A

the group of muscle myofilaments, contractile elements of myofiber

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5
Q

What is a myoblast?

A

a myofiber precursor- cells that differentiate into mature muscle cells

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6
Q

What are myofibers?

A

single muscle cells, made of multiple myofibrils which are made of myofilaments

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7
Q

What are fascicles?

A

groups of myofibers

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8
Q

Proteins that make up the thick filaments in myofilaments

A

myosin- II

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9
Q

Proteins that make up the thin filaments in myofilaments

A

actin, tropomyosin, and troponin

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10
Q

What is a sarcomere?

A

the unit arrangement of myofilaments that is the structural and contractile unit of muscle

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11
Q

What is perimysium?

A

the connective tissue that surrounds muscle fasicicles

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12
Q

What is epimysium?

A

dense irregular connective tissue that covers the surface of muscles

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13
Q

What is endomysium?

A

the collagenous tissue that surrounds the individual myofibers (muscle cells)

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14
Q

What is a syncytium?

A

a multinucleate mass, muscle cells are an example of this

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15
Q

Smooth muscle contraction is like

A

a wringing of a towel

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16
Q

innervation of smooth muscle

A

autonomic innervation which is also responsive to stretching to circulating hormones

17
Q

Innervation of skeletal muscle

A

voluntary control with neuromuscular junction with a motor end plate.
Axon terminal has synaptic vesicles which contain neurotransmitter acetylcholine

18
Q

Red fiber

A

type of skeletal muscle with more myoglobin pigment and are slow twitch fibers

19
Q

White fibers

A

type of skeletal muscle with less myoglobin pigment and are fast twitch fibers

20
Q

intermediate muscle fibers

A

mixture of red and white muscle fibers

Micro Anatomy and Histology (3 decks)

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