Questions with Correct Answers HJ HJ HJ
100% Verified Graded A+ HJ HJ HJ
1. What imbalance lessens the rate of secretion of parathyroid hormone (PTH)?
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a. Increased serum calcium levels
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HJ b.Decreased serum magnesium levels HJ HJ HJ
c. Decreased levels of thyroid-stimulating hormone
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d. Increased levels of thyroid-stimulating hormone
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Answer: A. The overall effect of parathyroid hormone (PTH)is to increase serum
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HJ calcium and to decrease serum phosphate concentration. The other presented
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imbalances will not affect PTH in the described fashion.
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2. Regulation of the release of catecholamines from the adrenal medulla is an
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HJ example of which type of regulation?
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a. Negative feedback HJ
HJ c.Neural
b. Positive feedbackHJ
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, d.Physiologic
Answer: c. The release of hormones occurs either in response to an alter- ation in the
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cellular environment or in the process of maintaining a regulated level of certain
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hormones or certain substances. Several different mechanisms, one of which is neural
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HJ control (e.g., stress-induced release of catecholamines from the adrenal medulla),
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regulate the release of hormones.The remaining options do not accurately describe the
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HJ example given. HJ
3. How does a faulty negative-feedback mechanism result in a hormonal im-
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HJ balance?
a.Hormones are not synthesized in response to cellular and tissue activities.
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HJ b.Decreased hormonal secretion is a response to rising hormone levels. c.Too little
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HJ hormone production is initiated.
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d.Excessive hormone production results from a failure to turn off the sys- tem.
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Answer: D. Negative-feedback systems are important in maintaining hormones within
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HJ physiologic ranges. The lack of negative-feedback inhibition on hormonal release
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HJ often results in pathologic conditions. Excessive hormone production, which is the
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HJ result of the failure to turn off the system, can cause various hormonal imbalances
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HJ and related conditions. The correct option is the only accurate description of this
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, hormonal function.
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4. Which substance is a water-soluble protein hormone?
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HJ a.Thyroxine
c.Follicle-stimulating hormone HJ
HJ b.Aldosterone
d.Insulin
Answer: D. Peptide or protein hormones, such as insulin, pituitary, hypothalamic, and
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parathyroid, are water soluble and circulate in free (unbound) forms. All the
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remaining options are fat-soluble hormones.
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5. Which of the following is a lipid-soluble hormone?
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HJ a.Cortisol
c.Epinephrine
b.Oxytocin
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d.Growth hormone HJ
Answer: A HJ
Cortisol and adrenal androgens are lipid-soluble hormones and are primarily bound to a
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carrier or transport protein in circulation. The other options are water-soluble
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hormones.
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, 6. Most protein hormones are transported in the bloodstream and are
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a. Bound to a lipid-soluble carrier HJ HJ HJ HJ
b. Free in an unbound, water-soluble form
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c. Bound to a water soluble-binding protein
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d. Free because of their lipid-soluble chemistry
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Answer: B HJ
Peptide or protein hormones, such as insulin, pituitary, hypothalamic, and parathy-
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HJ roid, are water soluble and circulate in free (unbound) forms. The other options are
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HJ not true statements related to the transport of protein hormones.
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7. when insulin binds its receptors on muscle cells, an increase in glucose uptake
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HJ by the muscle cells is the result. This is an example of what type of effect by a
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HJ hormone?
a. Pharmacologic
HJ c.Synergistic
HJ b.Permissive
HJ d.Direct
Answer: D HJ
Direct effects are the obvious changes in cell function that specifically result from
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