Question

Increase in bleeding time and delay in blood coagulation occur due to deficiency of
A. Adrenaline
B. Noradrenaline
C. Parathormone
D. Thyroxine

Answer 1

Hint: This hormone is secreted by parathyroid gland. Parathyroid glands are small glands present behind the thyroid gland in the neck.

Complete answer:
- Hormones are chemical messengers that are secreted directly into the blood that brings them to the organs and tissues of the body to fulfill their functions. There are several types of hormones that work on various facets of body function and operation.
- Adrenaline which is also known as epinephrine is a hormone and a drug. Adrenaline is usually developed by the adrenal glands and a limited number of neurons in the medulla oblongata, where it functions as a neurotransmitter included in the modulation of visceral activity.
- Norepinephrine, also known as noradrenaline or noradrenaline, is an organic chemical in the catecholamine family that acts as a neurotransmitter and hormone in the body and the brain.
- Parathormone or parathyrin is a hormone released by parathyroid glands that controls the concentration of serum calcium through its impact on bone, kidney and intestine. Parathormone raises the amount of Ca in the blood.
- The rise in bleeding time and the delay of blood coagulation is due to the deficiency of parathormone because the deficiency of parathormone induces a decrease of calcium levels in the blood and calcium ion is necessary for blood coagulation.
- Thyroxine is a hormone that secretes the bloodstream from the thyroid gland. When in circulation, thyroxine passes to tissues, such as the liver and kidneys, where it is transformed to the active form of triiodothyronine.

Thus, the correct answer is option C. i.e., Parathormone.

Note: Parathyroid hormone is specifically active in the muscles, bloodstream and small intestines. In the bones, the parathyroid hormone induces the production of calcium by an indirect mechanism of osteoclasts, which eventually contributes to bone resorption.