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LBBBI15 > Lesson 5 - Muscle Physiology > Flashcards

Lesson 5 - Muscle Physiology Flashcards

1
Q

This type of muscle controls movement, posture, and protection

A

Skeletal muscle

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2
Q

This type of muscle encompasses the heart

A

Cardiac muscle

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3
Q

This type of muscle has varying functions in the gastrointestinal, reproductive, urinary, vascular, and respiratory systems

A

Smooth muscles

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4
Q

Striated due to the presence of actin and myosin

A

Skeletal muscle

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5
Q

Non-striated

A

Smooth muscle

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6
Q

Striated with the presence of intercalated discs

A

Cardiac muscles

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7
Q

What are the functions of skeletal muscles?

A
  1. Locomotion and breathing
  2. Postural support
  3. Protection
  4. Communication (facial muscles)
  5. Eating (muscles of mastication)
  6. Heat production (shivering)
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8
Q

A term used for muscle cells

A

Myocytes

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9
Q

The cell membrane of a muscle is…

A

Sarcolemma

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10
Q

The cytoplasm of a muscle is referred to as ___________

A

Sarcoplasm

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11
Q

Smooth endoplasmic reticulum

A

Sarcoplasmic reticulum

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12
Q

Muscle fibers are also called

A

Myofibrils

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13
Q

Myofibrils are wrapped together by a connective tissue called _____________

A

Endomysium

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14
Q

Individual bundles of muscle fibers are called ____________

A

Fascicle

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15
Q

A single fascicle is surrounded by ______________

A

Perimysium

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16
Q

Multiple fascicles are bundled by ______________

A

Epimysium

17
Q

Muscles are bound to the bone through ______________

A

Tendons

18
Q

Undifferentiated cells that give rise to myocytes

A

Myoblasts

19
Q

The unit of a muscle is ______________

A

Sarcomere

20
Q

What are the two types of myofilaments that make up sarcomeres?

A

Actin and Myosin

21
Q

These are thin filaments that are also called the I-bands.

A

Actin

22
Q

These are thick filaments that are also called the A-bands.

A

Myosin

23
Q

What is the RMP of Muscle Action Potential?

A

-90 mV, producing a single muscle twitch

24
Q

What is the RMP of Nerve Action Potential?

A

-70 mV, having a velocity much faster than in muscle action potential

25
Q

True or False: When one motor neuron stimulates several muscle fibers, an action potential from this single motor neuron will stimulate ALL the muscle fibers it innervates

A

True

26
Q

This assists in the events of cross-bridge cycling that drives muscle contraction.

A

Calcium

27
Q

True or False: Without excitation there is NO contraction

A

True

28
Q

Single stimulus which is followed by a latent period, contraction, period, and relaxation period

A

Single twitch

29
Q

Additive effect of frequent stimuli and contractions to produce increased muscle tension

A

Summation

30
Q

Muscle tension is at a maximum and will not increase even with repeated stimulus

A

Tetanus

31
Q

Lack of response due to prolonged or strong stimulations

A

Muscle fatigue

LBBBI15 (10 decks)

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