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Blood calcium is increased by administra...

Blood calcium is increased by administration of

A

Glucagon

B

Thyroxine

C

Parathormone

D

Calcitonin.

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Blood calcium is increased by administration of," we will analyze each of the provided options step by step. ### Step 1: Analyze Glucagon - **Function**: Glucagon is secreted by the alpha cells of the pancreas. - **Effect on Blood Calcium**: It primarily increases blood sugar levels by stimulating glycogenolysis (the breakdown of glycogen to glucose) and gluconeogenesis (the synthesis of glucose). - **Conclusion**: Glucagon does not affect blood calcium levels. **(Incorrect option)** ### Step 2: Analyze Thyroxine - **Function**: Thyroxine is secreted by the thyroid gland. - **Effect on Blood Calcium**: It stimulates the consumption of oxygen by metabolically active cells and increases the oxidation of glucose in tissues. - **Conclusion**: Thyroxine is related to glucose metabolism and does not increase blood calcium levels. **(Incorrect option)** ### Step 3: Analyze Parathormone - **Function**: Parathormone (also known as parathyroid hormone or PTH) is secreted by the parathyroid glands. - **Effect on Blood Calcium**: It increases calcium reabsorption in the kidneys and mobilizes calcium from bones into the bloodstream. - **Conclusion**: Parathormone effectively increases blood calcium levels. **(Correct option)** ### Step 4: Analyze Calcitonin - **Function**: Calcitonin is secreted by the parafollicular cells (C-cells) of the thyroid gland. - **Effect on Blood Calcium**: It acts on bones and kidneys to reduce blood calcium levels by inhibiting osteoclast activity (cells that break down bone) and promoting calcium excretion in the kidneys. - **Conclusion**: Calcitonin decreases blood calcium levels. **(Incorrect option)** ### Final Answer Based on the analysis, the hormone that increases blood calcium levels is **Parathormone**. ---
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