Match the term with the appropriate description.A. Lipids that cause smooth muscle relaxation and vasodilationB. Lymph nodules aggregated in the small intestinal wallC. Rounded epithelial structures found in the medulla of thymusD. Areas of a lymph node where lymphocytes divideE. A chemical released from mast cells that causes vasodilationGerminal centers
Fill in the blank(s) with the appropriate word(s).
Answer: D
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________ are essential for the reproduction of B cells and other types of cells
A) Memory B-cells B) Regulatory T-cells C) Helper T-cells D) Cytotoxic T-cells
What is the correct sequence of events at a synapse?
(1) neurotransmitter release/diffusion (2) generation of action potential in the postsynaptic cell axon (3) arrival of nerve impulse at synaptic knob in presynaptic cell (4) removal of neurotransmitter molecules from receptors (5) binding of neurotransmitter to receptors A) 3, 1, 5, 2, 4 B) 2, 3, 1, 4, 5 C) 3, 1, 5, 4, 2 D) 1, 5, 4, 2, 3 E) 2, 3, 1, 5,
Which of the following statements about hormones is correct?
A. All hormones secreted by the anterior and posterior pituitary glands are peptides. B. Anterior pituitary hormones are synthesized in the hypothalamus. C. Only steroid hormones can regulate the secretion of steroid hormones. D. All of the hypophysiotropic hormones are peptides. E. IGF-1 stimulates growth by increasing growth hormone secretion through positive feedback.
The gastric phase of gastric secretion is triggered by the
A) sight, thought, or smell of food. B) entry of food into the stomach. C) entry of chyme into the small intestine. D) entry of chyme into the large intestine. E) release of cholecystokinin and secretin by the small intestine.