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Question: Put the steps in the regulation of blood calcium levels in the correct location –Free Chegg Question Answer

Transcribed text From Image: Put the steps in the regulation of blood calcium levels in the correct location. CONTROL CENTER Parathyroid glands release parathyroid hormone EFFECTORS Osteoblasts deposit calcium in bones RECEPTORS CONTROL CENTER Thyroid gland releases calcitonin Parathyroid gland cells sense the decrease in blood calcium RESPONSE Blood calcium level is returned to normal STIMULUS Blood EFFECTORS Osteoclasts break down bone to release calciumm calcium level increases too high RECEPTORS Cells in STIMULUS Blood the thyroid gland sense the increase in blood calcium level decreases calcium cium level too low Response Bood calcium level isreturned to norma Reset

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CONTROL CENTERThyroid gland releases Calcitonin
RECEPTORS Cells inthe thyroid gland sense the increase in blood calciumEFFECTORS
Osteoblasts deposit calcium in bone
STIMULUSBlood calcium level increasesRESPONSE Bloodcalcium level is returned to normal
Too HighNormal Blood calcium levelToo low
STIMULUS BloodCalcium level decreasesResponseBlood calcium level is returned to normal
RECEPTORSParathyroid gland cellssense the decrease in blood calciumEFFECTORSOsteoclasts break downbone to release calcium
CONTROL CENTERParathyroid glands release parathyroid hormone


  • Calcium levels in the blood are in the range of 9-11 mg/ 100ml. The homeostasis of calcium levels is maintained by thyroid glands through Calcitonin, and parathyroid glands via Parathyroid hormone (PTH). 1, 25 Dehydroxycholecalciferol (secreted from Kidney) also plays a role in the homeostasis of calicum by increasing its absorption from intestine (thus increases blood calcium)
  • Any homeostatic control consists of a feedback system which is made up of receptor, Control center and Effectors.
  • Stimulus is the change in the set point of a controlled condition. Receptors detect the changes in the set point and convey the information to the control center by nerve impulses. Control center responds to the information and sends information to the effectors to restore the condition.

a. When calcium level increases:

When the calcium level increases, raise in calcium levels serves as stimulus. Thyroid cells acts as receptors by sensing these changes and thyroid gland (control center) releases Calcitonin which acts on the osteoblasts (effectors). Excess calcium is deposited in the bones thus restoring the calcium levels to normal.

b. When calcium level decreases:

When the calcium level decreases, reduction in blood calcium serves as stimulus which is detected by the receptor cells of parathyroid glands (control center). Parathyroid glands secrete PTH which acts on the osteoclasts (effectors) that breaks the bone matrix and release calcium into the blood. This increases the calcium levels back to normal.

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