Regulating Ca2+ Levels

Question 1

Parathyroid Hormone (PTH)

Answer 1

•released from parathyroid gland(four small glands attached to the thyroid)
•increases Ca2+ levels in the blood
•travels to:
BONES- breakdown of bone to release Ca2+
KIDNEY- increases reabsorption of Ca2+
SMALL INTESTINE- increase absorption of Ca2+ from good

Question 2

Calcitonin

Answer 2

•Released from thyroid gland, decreases Ca2+ in blood
• works on the same tissue/bones like PTH, but decreases Ca2+ levels in the blood

Question 3

Hypersecretion of PTH/ Hyposecretion of calcitonin

Answer 3

•Causes osteoporosis: too much bone breakdown, causes bones to become brittle

Question 4

Hyposecretion of PTH/ Hypersecretion of Calcitonin

Answer 4

• lack of Ca2+ causes muscle contraction, and also kidney stones (Ca2+ precipitating out of urine)