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The two primary cell types of the nervous system are _______ and _______.

A male silkworm moth locates a female at a distance by

The activation of helper T cells is likely

Which of the following is not a leukocyte?

Action potentials are generated in response to touch in skin mechanoreceptors when

The fear response that is triggered by a potentially dangerous situation results from activation of the

The greatest intensity of perceived smell comes from the

Interactions between macrophages and lymphocytes are coordinated by

In the spinal cord, the gray matter contains the _______, and the white matter contains the _______.

Blood enters a nephron’s vascular component and is filtered by way of the