The following diagram shows the regulation of blood calcium (Ca²⁺) levels in the body - HSC - SSCE Biology - Question 12 - 2023 - Paper 1
Question 12
The following diagram shows the regulation of blood calcium (Ca²⁺) levels in the body.
Thyroid gland releases calcitonin
Calcitonin stimulates calcium salt deposit... show full transcript
Worked Solution & Example Answer:The following diagram shows the regulation of blood calcium (Ca²⁺) levels in the body - HSC - SSCE Biology - Question 12 - 2023 - Paper 1
Step 1
Thyroid gland releases calcitonin
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The thyroid gland is responsible for the release of calcitonin, a hormone that helps regulate calcium levels in the blood. When blood calcium levels rise above the normal range (9–11 mg/100 mL), the thyroid gland detects this imbalance.
Step 2
Calcitonin stimulates calcium salt deposit in bone
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In response to elevated blood calcium levels, calcitonin is secreted to stimulate the deposition of calcium salts in bone. This process helps to lower the calcium concentration in the bloodstream.
Step 3
Calcium homeostasis of blood
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The interaction of the thyroid gland and calcitonin plays a critical role in maintaining calcium homeostasis. By promoting storage of calcium in bones, calcitonin ensures that blood calcium levels remain within the healthy range, preventing disorders associated with both excess and deficient calcium.
Step 4
Rising blood Ca²⁺ levels
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
If there is an imbalance leading to rising blood calcium levels, calcitonin is released more prominently, ensuring that the levels return to the recommended range.
Step 5
Falling blood Ca²⁺ levels
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Conversely, if blood calcium levels drop below the normal range, calcitonin secretion decreases, allowing for the release of calcium from bones into the bloodstream.
