4. Blood Calcium

Question 1

What Glands Regulate Blood Calcium?

Answer 1

1-Thyroid gland
* Key hormones: calcitonin & thyroxine

2-Parathyroid gland
* Key hormone: Parathyroid hormone (PTH)

Question 2

What is the Function of Calcitonin?

in Thyroid Gland

Answer 2

• Acts on bone cells lowering calcium level in blood
• prevents absorption large intenstine preventing calcium being released by bones.
• prevents Reabsorbed in kidney to be excreted in urine.

Question 3

What is the Function of Parathyroid hormone?

in Parathyroid gland

Answer 3

• When there is low calcium levels in blood, parathyroid hormone is released
• Causes calcium to increase and phosphorus to decrease
• Acts on bones, kidneys and large intestine
• When calcium is raised, it contols itself (negative feedback loop)