Your Developmental Psychology Class Finds a Positive Correlation Between the Height

question 127

Essay

Your Developmental Psychology class finds a positive correlation between the height and weight of the class members. A class member asks, "What does early nutrition have to do with this finding?" This class member has stumbled onto what issue associated with correlations?
•the third-variable problem
•the direction-of-causation problem
•random assignment
•the independent variable

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Definitions:

Axon Terminal

The end of an axon, which makes synaptic connections with another nerve cell or with a muscle or gland cell, allowing for the transmission of electric nerve impulses.

Neurotransmitter

Chemical substances released at the end of a nerve fiber by the arrival of a nerve impulse, which by diffusing across the synapse or junction causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.

T-tubule

Tubular extensions of the cell membrane in muscle cells, which play a critical role in the conduction of electrical signals for muscle contraction.

Action Potential

A short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, allowing nerve cells to communicate.