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LBBBI15 > MUSCLE PHYSIOLOGY > Flashcards

MUSCLE PHYSIOLOGY Flashcards

1
Q

Three types of muscles:

A
  1. Skeletal
  2. Cardiac muscle
  3. Smooth muscle
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2
Q

Striated due to the presence of actin and myosin

A

Skeletal muscle

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3
Q

Non-striated

A

Smooth muscle

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4
Q

Striated; Presence of intercalated dics

A

Cardiac muscle

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5
Q

Functions of Skeletal Muscles

A
  1. locomotion and breathing
  2. postural support
  3. protection
  4. communication
  5. eating
  6. heat production
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6
Q

Skeletal muscle fibers are

A

multinucleated

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7
Q

TRUE or FALSE: Skeletal muscles contain many mitochondria

A

TRUE

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8
Q

Fill in the blanks: Skeletal muscles consists of thousands of muscle fibers (_____________) wrapped together by connective tissue called __________________.

A

myofibrils, endomysium

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9
Q

Fill in the blanks: Individual ____________________________ in a skeletal muscle are known as a ____________.

A

bundles of muscle fibers, fascicle

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10
Q

A single fascicle is surrounded by ______________.

A

perimysium

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11
Q

Multiple fascicles are bundled by ________________.

A

epimysium

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12
Q

Muscles are bound to bone through ___________.

A

tendons

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13
Q

What undifferentiated cells give rise to myocytes?

A

Myoblasts

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14
Q

The cell membrane of a muscle is ___________________.

A

Sarcolemma

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15
Q

What is Sarcomere?

A

the individual muscle fiber

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16
Q

Two types of myofilaments:

A

Actin and Myosin

17
Q

These are Thin filaments, light bands, also called I-bands

A

Actin

18
Q

These are Thick filaments, dark bands, and myosin heads for binding to actin, also called the A-band

A

Myosin

19
Q

Unit of Muscle is?

A

Sarcomere

20
Q

In Muscle Action Potential,

A

Resting Membrane Potential =. -90mV

21
Q

When one motor neuron stimulates several muscle fibers, an ______________________ from this single motor neuron _______________________________________________________________ it innervates.

A

action potential, will stimulate ALL the muscle fibers

22
Q

An _______________________ travels along a ____________________.

A

action potential, motor nerve

23
Q

___________________ is released into the synaptic cleft

A

Acetylcholine

24
Q

TRUE or FALSE: Ach binds and opens Ach-gated channels

A

TRUE

25
Q

TRUE or FALSE: Sodium (Na) diffuses superiorly resulting in depolarization of the sarcolemma

A

FALSE

26
Q

TRUE or FALSE: An action potential travels along the sarcolemma to the T-tubules

A

TRUE

27
Q

TRUE or FALSE: Potassium ions are released from the sarcoplasmic reticulum

A

FALSE

28
Q

___________ assists in the events of cross-bridge cycling that drive muscle contraction.

A

Calcium

29
Q

TRUE or FALSE: Without excitation there is NO contraction.

A

TRUE

LBBBI15 (10 decks)

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