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Anatomy > Chapter 6 Quiz > Flashcards

Chapter 6 Quiz Flashcards

1
Q

Organ of the muscular system

A

Skeletal muscles

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2
Q

Three types of muscle

A

Skeletal, cardiac, smooth

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3
Q

Functions of the muscular system

A

Movement
Posture
Joint stability
Heat production

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4
Q

Muscle fiber

A

A single muscle cell

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5
Q

Endomysium

A

Connective tissue membrane that surrounds each muscle fiber

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6
Q

Fascicles

A

Bundles of muscle fibers bound together by a membrane called the perimysium

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7
Q

Perimysium

A

Connective tissue membrane that bundles together multiple muscle fibers

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8
Q

Epimysium

A

OUTERMOST connective tissue membrane that bundles together several fascicles and blends into the tendons

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9
Q

Sarcolemma

A

“Muscle husk”

Plasma membrane of each muscle cell

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10
Q

Anatomy of a skeletal muscle fiber

A
  1. Sarcolemma
  2. Multiple nuclei
  3. Sarcoplasmic reticulum
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11
Q

Sarcoplasmic reticulum

A

Specialized type of smooth ER
surrounds each myofibril
Stores calcium for use

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12
Q

Myofibrils

A

Specialized organelles in muscle cells
Contain sarcomeres
Made up of actin and myosin filaments
They fill most of the cytoplasm of the cell

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13
Q

Sarcomere

A

Basic contractile unit of the muscle fiber

extends from z-disk to z-disk

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14
Q

A band

A

Dark band

Region where myosin filaments overlap

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15
Q

I band

A

Light band

Region that contains only actin filaments

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16
Q

Z disk

A

Forms borders of the sarcomere

17
Q

M line

A

Center of the sarcomere

Region that only contains myosin

18
Q

Functional properties of skeletal muscle fibers

A
  1. Irritability

2. Contractility

19
Q

Irritability

A

Ability to receive and respond to a stimulus

20
Q

Contractility

A

Ability of a muscle fiber to shorten

21
Q

Motor unit

A

The functional unit of an entire muscle

22
Q

Neuromuscular junction

A

Region where the nerve fiber meets the muscle fiber

23
Q

Axon terminals

A

Branches that extend from the nerve and form junctions with the sarcolemma

24
Q

Synaptic cleft

A

Gap formed between the nerve fiber and the muscle fiber; this gap is filled with the interstitial fluid that bathe all cells

Anatomy (12 decks)

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