Explain how the nervous system and hormones regulate the secretion of gastric juice. What will be an ideal response?
Concepts to Consider: Smelling or tasting food causes the brain to send messages to gastric glands in
the stomach, stimulating them to secrete. When food distends the stomach, stretch receptors send
messages to the medulla, which sends messages to the endocrine cells of the stomach that secrete the
hormone gastrin. Gastrin is absorbed into the blood, returns to the stomach, and stimulates gastric juice
release, gastric emptying, and intestinal motility.
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In evolutionary trees, each node represents a(n) _____
a. single lineage b. extinction c. point of divergence d. adaptive radiation
Which of the following transmission modes is available for plants?
A) direct B) intermediate vector C) multiple hosts and stages D) all of the above
Exocrine glands:a
have a duct. b. cannot secrete mucus. c. are made of endothelial tissue. d. secrete hormones. e. transport products through interstitial fluid.
A neuron and a nerve differ in that
A. nerves are bundles of fibers and neurons are single cells. B. neurons carry impulses and nerves do not. C. neurons are found in the peripheral nervous system only. D. nerves are attached to neurons.