2/6/24, 12:59 PM
PhysioEx Exercise 2 Activity 1
https://media.pearsoncmg.com/bc/bc_0media_ap/physioex/10/ex2/act1/
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Experiment Data
Post-lab Quiz Results
You scored 100% by answering 6 out of 6 questions correctly.
Review Sheet Results
You correctly answered: All the steps of excitation-contraction coupling occur.
An action potential in a motor neuron triggers the release of which neurotransmitter?
You correctly answered: acetylcholine.
1
The term skeletal muscle fiber refers to
You correctly answered: an individual skeletal muscle cell.
2
The graded depolarization in the skeletal muscle fiber that is elicited in response to one
action potential from the motor neuron is called
You correctly answered: an EPP (end-plate potential).
3
Which of the following is not a phase of a skeletal muscle twitch?
You correctly answered: hyperpolarization phase.
4
A skeletal muscle twitch is
You correctly answered: one contractile response to a single action potential.
5
Which of the following correctly matches the twitch phase with its definition?
You correctly answered: the contraction phase: the time between the end of the latent
period and peak muscle tension.
6
Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus,
and latent period.
Your answer:
skeletal muscle fiber: single muscle cell that consists of skeletal muscle. motor unit: a motor neuron with the muscle fiber it innervates.
skeletal muscle twitch: response to a single action potential.
electrical stimulus: makes the muscles contract.
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