19. The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca2+) homeostasis. If a person has a blood-calcium (Ca2+) level of 8mb/100ml of blood, which of the following mechanisms does the body use to maintain blood-calcium homeostasis? The diagram shows the intermal fesdback mechanism that maintains blood-cakcium (Ca

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
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19. The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca2+)
homeostasis. If a person has a blood-calcium (Ca2+) level of 8mb/100ml of blood, which of the
following mechanisms does the body use to maintain blood-calcium homeostasis?
47 The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca
homeostasis.
Increases Ca
reabsorption
in Intestines
Active
vitamin D
Stimulates
Ca reabsorption
in kidneys
Releases
PTH
parathyrold
hormone
Stimulates
Ca release
from bones
Parathyrod
9land
(behind thyoid)
Blood Cat
level rises
Homeostasis:
Blood Cat level
(about 10 ma/100 mL)
Stimulus:
Falling blood
Cat level
Ir a person has a blood-calcium (Ca) level of 8 ma/100 ml of blood, which of the following
mechanisms does the body use to maintain blood-calcium homeostasis?
a. The kidneys take up more Ca2+ and release vitamin D.
b. The bones release Ca2+
c. The intestines increase reabsorption of Ca2+
d. All of the above
Transcribed Image Text:19. The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca2+) homeostasis. If a person has a blood-calcium (Ca2+) level of 8mb/100ml of blood, which of the following mechanisms does the body use to maintain blood-calcium homeostasis? 47 The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca homeostasis. Increases Ca reabsorption in Intestines Active vitamin D Stimulates Ca reabsorption in kidneys Releases PTH parathyrold hormone Stimulates Ca release from bones Parathyrod 9land (behind thyoid) Blood Cat level rises Homeostasis: Blood Cat level (about 10 ma/100 mL) Stimulus: Falling blood Cat level Ir a person has a blood-calcium (Ca) level of 8 ma/100 ml of blood, which of the following mechanisms does the body use to maintain blood-calcium homeostasis? a. The kidneys take up more Ca2+ and release vitamin D. b. The bones release Ca2+ c. The intestines increase reabsorption of Ca2+ d. All of the above
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