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1) Homeostasis requires feedback loops in order maintain relatively constant internal condition Below, you will find a situation in which homeostasis is being maintained: The human body must work to maintain a relatively constant concentration of Ca2+ in the blooc When the blood [Ca2*] drops below normal levels, cells called osteoclasts will release stored C: by breaking down bone. In order to begin this process, the osteoclasts must first come into contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue. PTH is a hormone that is produced by the parathyroid glands when these glands detect that the blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca2+] close to healthy levels, less PTH is secreted, until finally the blood [Ca2"] is back to healthy levels an no PTH is secreted anymore. a) Identify the sensor, control center, and effector in the situation described above. Sensor: Control center: Effector: b) Is this a negative or positive feedback loop?

1) Homeostasis requires feedback loops in order maintain relatively constant internal condition Below, you will find a situation in which homeostasis is being maintained: The human body must work to maintain a relatively constant concentration of Ca2+ in the blooc When the blood [Ca2*] drops below normal levels, cells called osteoclasts will release stored C: by breaking down bone. In order to begin this process, the osteoclasts must first come into contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue. PTH is a hormone that is produced by the parathyroid glands when these glands detect that the blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca2+] close to healthy levels, less PTH is secreted, until finally the blood [Ca2"] is back to healthy levels an no PTH is secreted anymore. a) Identify the sensor, control center, and effector in the situation described above. Sensor: Control center: Effector: b) Is this a negative or positive feedback loop?

Human Anatomy & Physiology (11th Edition)
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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1) Homeostasis requires feedback loops in order maintain relatively constant internal conditions Below, you will find a situation in which homeostasis is being maintained: The human body must work to maintain a relatively constant concentration of Ca2+ in the blood When the blood [Ca2+] drops below normal levels, cells called osteoclasts will release stored Ca by breaking down bone. In order to begin this process, the osteoclasts must first come into contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue. PTH is a hormone that is produced by the parathyroid glands when these glands detect that the blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca2+] closer to healthy levels, less PTH is secreted, until finally the blood [Ca?+] is back to healthy levels and no PTH is secreted anymore. a) Identify the sensor, control center, and effector in the situation described above. Sensor: Control center: Effector: b) Is this a negative or positive feedback loop? FIN
Transcribed Image Text:1) Homeostasis requires feedback loops in order maintain relatively constant internal conditions Below, you will find a situation in which homeostasis is being maintained: The human body must work to maintain a relatively constant concentration of Ca2+ in the blood When the blood [Ca2+] drops below normal levels, cells called osteoclasts will release stored Ca by breaking down bone. In order to begin this process, the osteoclasts must first come into contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue. PTH is a hormone that is produced by the parathyroid glands when these glands detect that the blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca2+] closer to healthy levels, less PTH is secreted, until finally the blood [Ca?+] is back to healthy levels and no PTH is secreted anymore. a) Identify the sensor, control center, and effector in the situation described above. Sensor: Control center: Effector: b) Is this a negative or positive feedback loop? FIN
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