HUMAN ANATOMY-ACCESS
9th Edition
ISBN: 9780134562773
Author: Martini
Publisher: PEARSON
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Chapter 5, Problem 5RFT
Summary Introduction
Introduction:
Normal bone growth depends on a number of factors. These factors promote bone growth, especially during the time of puberty. Sex hormone also plays an important role in the bone production.
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Richard had symptoms of excessive secretion of PTH (high blood calcium levels), and his physicians were certain he had a parathyroid gland tumor. Yet when surgery was performed on his neck, the surgeon could not find the parathyroid glands at all. Where should the surgeon look next to find the tumorous parathyroid gland?
3) Parathyroid hormone:
a) is secreted when blood calcium levels are too high.
b) is required for the synthesis of collagen fibers.
c) stimulates osteoclasts to break down bone tissue.
d) stimulates cells in the epiphyseal plate to divide.
Osteoporosis is a common disease in the elderly. Bones become less dense and more likely to break. Treatment of osteoporosis frequently falls under endocrinologists.
a) List two hormones that you have learned about in this course that impact osteoporosis.
b) Explain how each one affects bone density.
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- Osteoclast activity decreases a) Growth hormone (GH) b) Calcitonin c) Sex steroids d) Parathormone (PTH)arrow_forwardIf the release of parathyroid hormone (PTH) INCREASES, what happens to a) osteoclast activity and b) Ca levels in the blood 1) a) decreases; b) increases 2) a) increases; b) decreases 3) a) decreases; b) decreases 4) a) increases; b) increasesarrow_forwardYou’ve studied both bone growth and hormonal effects. Which gonadal hormone promotes epiphyseal closure in both males and females, and what is the effect of epiphyseal closure?arrow_forward
- A black market for growth hormone abuse already exists among weight lifters and other athletes. What actions of growth hormone would induce a full-grown athlete to take supplemental doses of this hormone? What are the potential detrimental side effects?arrow_forwardWhich of the following hormones are released when blood calcium levels fall? Question 97 options: a) Calcitonin b) Thyroxin c) Hydroxyapatite d) Parathyroid hormonearrow_forwardBone remodeling in adults is regulated and directed mainly by (a) growth hormone, (b) thyroid hormones, (c) sex hormones, (d) mechanical stress, (e) PTH.arrow_forward
- Select the best answer or answers from the choices given: Parathyroid hormone (a) increases bone formation and lowers blood calcium levels, (b) increases calcium excretion from the body, (c) decreases calcium absorption from the gut, (d) demineralizes bone and raises blood calcium levels.arrow_forwardDescribe the process by which bone lengthens?arrow_forwardKing Egbert VI is falling ill. His calcium concentration is dropping to dangerously low levels. Parathyroid hormone (PTH) is released and blood calcium levels begin to rise. Shortly after, PTH release slows. Is this an example of a positive or negative feedback mechanism and what is the initial stimulus? a) Positive feedback; reduced PTH b) Negative feedback; increase PTH release c) Positive feedback; decline in calcium release d) Negative feedback; low calcium e) Negative feedback; reduced PTHarrow_forward
- Which hormone is responsible for gigantism and acromegaly?arrow_forward_____1_____ is the hormone produced by the parathyroid gland that causes bone resorption; ______2______ is the hormone produced by the parathyroid gland that increases deposition of bone matrix.A: 1) Calcitonin ; 2) PTHB: 1) Calcitonin ; 2) EstrogenD: 1) PTH ; 2) CalcitoninE: 1) PTH ; 2) CholecalciferolF: 1) RANK-L ; 2) OPGarrow_forwardOsteoblasts have abundant receptors for what two hormones? Why?arrow_forward
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