If You Removed the External Ca⁺⁺ at the Neuromuscular Junction

question 32

Multiple Choice

If you removed the external Ca⁺⁺ at the neuromuscular junction, you would most directly affect which of the following?

• A) action potential in motor neuron
• B) acetylcholine exocytosis
• C) end-plate potential
• D) None of the choices would be affected.

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Definitions:

Posttest-Only

A research design where measures are taken only after the experimental manipulation, without a pretest comparison.

Mortality

The loss of subjects who decide to leave an experiment. Mortality is a threat to internal validity when the mortality rate is related to the nature of the experimental manipulation.

Experimental Design

A research design used to test hypotheses and establish cause-effect relationships by manipulating one or more independent variables and observing the effect on dependent variables.

Mortality

The incidence of death within a population; in research, it can also refer to the dropout rate of participants from a study.