Which of the endocrine organs can effectively control the pituitary gland?
A. Pancreas
B. Hypothalamus
C. Thyroid gland
D. Pineal gland
Answer: B
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One way that cells can increase their responsiveness to an external chemical regulator is by
A. increasing the number of their transmembrane receptors by endocytosis. B. increasing the number of their transmembrane receptors by exocytosis. C. uncoupling their receptors from the second message generator. D. mutating their extracellular receptors so that the affinity for the chemical regulator is reduced. E. decreasing the number of their transmembrane receptors by endocytosis.
Which of the following is true of megakaryocytes?
A. They give rise to macrophages. B. They give rise to platelets. C. They secrete histamine. D. They aggregate to plug tears in blood vessels. E. They are small (no larger than 2 to 4 mm in diameter).
Which cell type in the lymph node has an active role in filtering the lymph?
A. T cells B. B cells C. Macrophages D. Reticular cells
When our brains process visual information about objects directly in front of us, they are able to use information that compares signals from the two eyes (steroscopic vision) in order to provide
A. color perception. B. brightness levels. C. depth perception. D. motion detection.