AP PSYCHOLOGY

BIOLOGICAL BASES OF BEHAVIOR

THE NERVOUS AND ENDOCRINE SYSTEMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In humans, which substance is directly responsible for controlling the calcium levels of the blood?
A
adrenaline
B
insulin
C
parathormone
D
thyroxin
Explanation: 

Detailed explanation-1: -Parathyroid glands produce parathyroid hormone, which plays a key role in the regulation of calcium levels in the blood.

Detailed explanation-2: -Parathyroid hormone (PTH) is a hormone your parathyroid glands release to control calcium levels in your blood. It also controls phosphorus and vitamin D levels. If your body has too much or too little parathyroid hormone, it can cause symptoms related to abnormal blood calcium levels.

Detailed explanation-3: -Parathyroid hormone regulates calcium levels in the blood, largely by increasing the levels when they are too low. It does this through its actions on the kidneys, bones and intestine: Bones – parathyroid hormone stimulates the release of calcium from large calcium stores in the bones into the bloodstream.

Detailed explanation-4: -There are at least three hormones intimately involved in the regulation of the level of calcium in the blood: parathyroid hormone (PTH), calcitonin and calcitriol (1, 25 dihydroxyvitamin D, the active form of vitamin D).

Detailed explanation-5: -PTH, also known as parathormone, is made by your parathyroid glands. These are four pea-sized glands in your neck. PTH controls the level of calcium in the blood. Calcium is a mineral that keeps your bones and teeth healthy and strong.

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