Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:The model shown in the figure represents the role of two hormones,
calcitonin and parathyroid hormone (PTH), in maintaining normal blood
calcium levels in humans. If a dietary change results in an increase in blood
calcium concentration above normal levels, which of the following is the
most likely effect on calcium homeostasis?*
Calcium Deposiled
in Bones
• Increased Calcium
Excretion
Thyroid Releases
Calcitonin
Blood Calcium
Levels Fall
Blood Calcium
Levels Rise
Normal Blood
Calcium Levcls
Blood Calciam
Levels Fall
Parathyroid Releases
Parathyroid Hormone
(PTH)
Blood Calcium
Levels Rise
Calcium Released
from Benes
• Decreased Calcium
Excretion
Calcitonin levels will decrease, thus stimulating the release of PTH.
Calcitonin levels will increase, thus promoting the deposit of calcium into bones.
PTH levels will decrease, thus stimulating the loss of calcium from bones.
O PTH levels will increase, thus preventing the release of calcitonin.
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