Mammary glands are modified ________ glands that develop within the female breasts.
A. ceruminous
B. apocrine
C. merocrine
D. sebaceous
E. eccrine
Answer: B
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The cerebral aqueduct runs through the ____________________.
Fill in the blank(s) with the appropriate word(s).
Select the answer that correctly orders the events that occur when a nerve signal reaches the synaptic knob.
(1) The neurotransmitters bind to receptors on the postsynaptic cell. (2) The postsynaptic cell is stimulated to initiate a nerve signal. (3) Synaptic vesicles release neurotransmitters via exocytosis. (4) Neurotransmitters diffuse across synaptic cleft. A. 1, 2, 3, 4 B. 2, 3, 1, 4 C. 4, 3, 1, 2 D. 3, 4, 1, 2 E. 2, 3, 4, 1
Keratinocytes are an important epidermal cell because they ________.
A) produce a fibrous protein that gives the skin much of its protective properties B) are able to transform from living cells to plasma membranes and still function C) are able to reproduce sporadically as needed D) are a powerful defense against damaging UV rays
The period between the start of one heartbeat and the beginning of the next is a single ________.
A) cardiac cycle B) arrhythmia C) diastole D) intermodal pathway E) systole