18_ActiveLecturePRS

18_ActiveLecturePRS - Which of these characteristics is...

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Which of these characteristics is exclusive to the endocrine system, when compared with the nervous system? 1. Relies on release of chemicals that bind to specific receptors 2. Relies primarily on negative feedback mechanisms 3. Uses epinephrine and norepinephrine as chemical messengers 4. Effective in coordinating cell, tissue, and organ activities on a sustained, long-term basis
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Which of the following statements is true of peptide hormones? 1. They are derived from cholesterol. 2. They are synthesized as prohormones and convert to active hormones before or after secretion. 3. They are also called biogenic amines and are synthesized from tyrosine. 4. They are important paracrine factors that coordinate cellular activities.
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If levels of a certain hormone are high , which of the following will happen? 1. A second messenger brings more of that hormone into the cell. 2. There will be a decrease in the number of cell receptors for that hormone and cells become less sensitive to it. 3. A G protein will bind to that hormone. 4. There will be an increase in the number of cell receptors for that hormone and cells become more sensitive to it.
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How does the presence of a molecule that blocks adenylate cyclase affect the activity of a hormone that produces its cellular effects by way of the second messenger cAMP? 1. It prevents synthesis of the hormone. 2. It enhances the action of the hormone. 3. It increases sensitivity to the hormone. 4. It decreases speed of hormonal changes.
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endocrine activities? 1. It secretes regulatory hormones that influence endocrine cells in the pituitary. 2. It has autonomic centers that exert direct neural control over endocrine cells of the adrenal medullae. 3.
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18_ActiveLecturePRS - Which of these characteristics is...

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