Chapter 8 1c Excitation Flashcards

1
Q

What are the four stages of muscle physiology?

A

excitation
excitation-contraction coupling
contraction
relaxation

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2
Q

What is the purpose of excitation in muscle contractions?

A

muscle is stimulated

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3
Q

What is the coupling (E-C) period of muscle contraction?

A

a short period between the signal and when the muscle starts contracting

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4
Q

What happens during the contraction phase of muscle contraction?

A

when the muscle shortens and contracts when the actin and myosin grab onto each other and pull

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5
Q

Is a cell more negatively charged inside or outside the cell?

A

inside

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6
Q

What is the resting membrane potential?

A

stored potential energy

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7
Q

what does it mean for a cell to be isotonic?

A

it has the same concentration inside and outside

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8
Q

what is a connection between two electrically excitable cells?

A

synapse

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9
Q

what is the synapse called that occurs where a nerve fiber connects with its target muscle?

A

neuromuscular junction (NMJ)

nerve top blue arrow muscle bottom blue arrow
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10
Q

Name the pink highlighted region

A

synaptic knob

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11
Q

name the pink highlighted region

A

synaptic vessicle

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12
Q

what does the synaptic vessicle carry?

A

a neurotransmitter called Acetylcholine

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13
Q

what is the abbreviation for acetycholine?

A

ACh

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14
Q

what is another name for the synaptic knob?

A

terminal

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15
Q

what is ACh and what does it do?

A

neurotransmitter that stimulates muscle cells

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16
Q

what part of the muscle cell is highlighted in pink?

A

sarcolemma

17
Q

what is the name for the region containing the sarcolemma where the muscle connects to the nerve?

A

motor end plate

18
Q

what are the pink highlighted regions on the motor end plate called?

A

junctional folds

19
Q

what is located along the junctional folds of the neuromuscular junction?

A

ACh receptors

20
Q

what is the pink highlighted region between the motor neuron and the muscle cell?

A

synaptic cleft

21
Q

What is the nerve impulse?

A

the quick flip in positive and negative charges

22
Q

What is another name for the nerve impulse?

A

action potential

23
Q

what is the process in the neuromuscular junction from nerve impulse to muscle action potential?

A
  • action potential (nerve impulse) comes down the neuron
  • calcium channels open due to the nerve voltage
  • calcium goes down concentration gradient into the synaptic knob
  • calcium triggers the synaptic vessicles to release ACh through exocytosis
  • calcium enters synaptic cleft
  • ACh binds to ACh receptors
  • sodium comes in, which changes the charge from positive to negative, and that creates a muscle action potential
  • muscle action potential spreads all throughout the muscle cell
24
Q

are the calcium channels voltage-gated in a neuromuscular junction event?

25
What is the resting membrane potential?
the negative potential energy inside of the cell before the nerve impulse hits
26
what happens to the cell charge when the sodium channels open and what is it called?
we go from negative to positive depolarization
27
after the cell charge goes past zero and becomes positive, what happens?
sodium channels start to close and potassium channels open
28
what is it called when the potassium exits the cell after the sodium creates a positive charge?
repolarization