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Meat Science > Muscle Contraction (Exam 3) > Flashcards

Muscle Contraction (Exam 3) Flashcards

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1
Q

What is electrical potential?

A

Difference in net charge

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2
Q

What is the extracellular fluid made of?

A

High concentration of Na+ and Cl-

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3
Q

What is the intracellular fluid made of?

A

High concentration of K+

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4
Q

What is the resting potential of the neuron and muscle membrane?

A

-90 mV

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5
Q

What is the resting potential maintained by?

A

Na+/K+ ATPase

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6
Q

What is action potential?

A

Momentary changed in electrical membrane potential

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7
Q

What is the action potential in neurons?

A

Nerve impulse

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8
Q

What type of process is action potential doing?

A

Electrochemical

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9
Q

How does action potential occur? (3)

A

Depolarization
Repolarization, re-establishin resting potential
Redistributing ions, maintaining resting potential

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10
Q

What is depolarization?

A

Sudden and drastic increase in permeability of Na+ causing reversing potential

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11
Q

What is repolarization?

A

At max reverse, K+ outward diffusion re-establishing potential

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12
Q

What does the depolarization current do?

A

Stimulate N+ channels in the adjacent region, depolarizing the next region

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13
Q

How does redistributing ions occur?

A

Na+/K+ ATPase redistributes Na+ and K+ hile maintaining resting potential

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14
Q

What does everything at the neuromuscular junction start with?

A

A sudden increase in Na+ permeability

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15
Q

How long do action potentials last?

A

0.5 to 1 ms

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16
Q

What is acetyl choline?

A

Neurotransmitter increasing Na+ permeability released at motor end plate of neuron contracting sarcolemma

17
Q

What are 7 events at the neuromuscular junction?

A
  1. Action potential travels to axon terminal of motor neuron
  2. Ca++ diffuses into axon terminal
  3. Acetylcholine released
  4. Acetylcholine binds to receptors at the motor endplate
  5. Na+ enters muscle fiber and K+ exits (depolarization)
  6. Action potential propagates along the sarcolemma to T tubules
  7. Removal of acetylcholine by acetylcholine esterase
18
Q

Where does action potential travel?

A

From sarcolemma to T-tubules

19
Q

What do T-tubules connect with?

A

Sarcoplasmic reticulum

20
Q

Where is the dihydropyridine receptor?

A

T-tubules

21
Q

Where is the C++ channel?

A

Terminal cisternae

22
Q

Where is Ca+ released from? Where does it go to?

A

SR

Sarcoplasm

23
Q

What triggers a contraction?

A

Ca+

24
Q

Watch videos and view pictures

A

Watch videos and view pictures

Meat Science (14 decks)

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