Module #5 - Muscle Histology And Physiology Flashcards Preview

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Flashcards in Module #5 - Muscle Histology And Physiology Deck (11)
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Define:
Sarcomere

The repeating unit of a myofibril.

1

Define:
Neuron

The functional unit of the nervous system, a nerve cell.

2

Define:
Synapse

The interface between a nerve cell and another cell.

3

Define:
Neurotransmitter

A chemical released by a neuron. This chemical travels across the synaptic cleft, allowing the neuron to communicate with another cell.

4

Define:
Motor unit

One motor neuron and all the muscle fibers it innervates.

5

Define:
All-or-none law of skeletal muscle contraction

An individual muscle fiber contracts with equal force in response to each action potential.

6

Define:
Subthreshold stimulus

A stimulus too small to create an action potential in a neuron.

7

Define:
Threshold stimulus

A stimulus strong enough to create one action potential in a neuron.

8

Define:
Submaximal stimuli

Stimuli of increasing strength that create more action potentials along more neurons.

9

Define:
Maximal stimulus

A stimulus which is strong enough to create action potentials in all the motor neurons innervating a whole muscle.

10

Define:
Muscle tone

The state of partial contraction in a muscle, even when the muscle is not being used.