The brain and spinal cord are protected and cushioned by three connective tissue membranes that are collectively called ________
A) ventricles
B) arachnoid villi
C) meninges
D) sinuses
C
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When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of
A. sodium ions. B. neuropeptides. C. neurotransmitters. D. calcium ions.
Describe the means by which the body regulates water content
What will be an ideal response?
Which of the veins listed here drains directly into the right atrium?
A) great cardiac vein B) anterior cardiac vein C) middle cardiac vein D) small cardiac vein
Which of the following cells has a flagellum?
A. A cell lining the respiratory tract B. A cell lining the uterine tube C. A spermatozoon D. A cell specialized for absorption, such as an epithelial cell of the small intestine E. A neuron