1. When calcitonin hormone is secreted? 2. How does calcitonin hormone decrease the concentrations of Ca2+ in the blood? 3. What is the role of parathyroid hormone in increasing the concentrations of Ca2+ in the blood? 4. What is the role of vitamin D in maintaining the concentration of Ca2+ in the blood?
1. When calcitonin hormone is secreted? 2. How does calcitonin hormone decrease the concentrations of Ca2+ in the blood? 3. What is the role of parathyroid hormone in increasing the concentrations of Ca2+ in the blood? 4. What is the role of vitamin D in maintaining the concentration of Ca2+ in the blood?
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:Activity 4
-losely study the figure below which shows the Regulation of blood Ca2+ levels bu
parathyroid hormone (PTH).
Stimulus
Low blood Ca2+
Parathyroid glands
(-)
bnile blow
Parathyroid
Secretes
PTH
(+)
(+)
Effector
Effector
Effector
Increased
absorption of Ca²+
from intestine (due
to PTH activation
of vitamin D)
Osteoclasts
Reabsorption of
Ca2+, excretion
of PO, 3-
dissolve Ca(PO,),
crystals in bone,
releasing Ca2+
Response
Increased
blood Ca2+
1. When calcitonin hormone is secreted?
2. How does calcitonin hormone decrease the concentrations of Ca2+ in the
blood?
3. What is the role of parathyroid hormone in increasing the concentrations of
Ca2+ in the blood?
4. What is the role of vitamin D in maintaining the concentration of Ca2+ in the
blood?
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