Unit 6 Flashcards

1
Q

What neurons stimulate muscle cells?

A

Motor neurons

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2
Q

What nervous system is responsible for muscles?

A

The somatic nervous system.

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3
Q

What NT is responsible for muscle movement?

A

Acetylcholine.

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4
Q

What is the local depolarization of muscle tissue called?

A

An End Plate Potential

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5
Q

What ion is released into muscles from an AP

A

Ca 2+

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6
Q

Why is there a latent period between the AP and the muscle contraction?

A

It takes time for the Ca 2+ to act

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7
Q

Destruction of acetylcholine is done by what enzyme?

A

Acetylcholinesterase

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8
Q

What does acetylcholine break down into?

A

Acetic Acid and Choline

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9
Q

What makes up a motor unit?

A

1 neuron + all the muscle fibers it suplies.

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10
Q

What are 2 ways to give smooth and sustained responses of varying strength?

A
  1. Change the frequency of stimulation2. Change the number of motor units activated
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11
Q

What is a fused tetanus?

A

When the inter-twitch relaxation period is too short, and there’s no relaxation between twitches.

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12
Q

What do muscles do in an unfused tetanus?

A

They quiver

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13
Q

What is the threshold stimulus of a muscle?

A

The first observable response.

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14
Q

What is the difference between isotonic and isometric contractions?

A

Isotonic contractions have a change in muscle length. Isometric ones don’t.

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15
Q

What are the 4 ways to maximize work done?

A

Recruit more muscle fibers, stimulate at a higher frequency, recruit larger muscle fibers, and stretch the muscle to over 100 percent stretch to find the sweet spot of roughly 120 percent.

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