Biology - Study Mode

[#931] Which is the innermost layer of the heart?
Correct Answer

(B) Endocardium

Explanation

Solution: The inner layer of the heart wall is the endocardium, composed of endothelial cells that provide a smooth, elastic, non-adherent surface for blood collection and pumping.

[#932] ________ is a hormone that regulates the amount of glucose in the blood.
Correct Answer

(D) Insulin

Explanation

Solution: Insulin is a peptide hormone made in the beta cells of the pancreas that is central to regulating carbohydrate metabolism in the body. After a meal, insulin is secreted into the bloodstream.

[#933] Which one of following is known as pace maker of endocrine gland?
Correct Answer

(A) Thyroxin

Explanation

Solution: Thyroxin is secreted by thyroid gland (the largest gland), situated in neck region. Thyroxine regulates the metabolic rate, thus, called as pacesetter of the body. If there's more of thyroxine present in the blood, processes take place at a faster rate, energy is utilized at a faster rate, and if the amount of thyroxine secreted is less than required, the processes of the body take place at a slower pace, lesser energy utilization. Thus, functioning of thyroid gland has major effect on all the organs of our body.

[#934] The rate of heartbeat is accelerated by the hormone
Correct Answer

(A) Adrenaline

Explanation

Solution: The rate of heartbeat is accelerated by the hormone. The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat.

[#935] Cortisol is secreted by
Correct Answer

(C) Adrenal gland

Explanation

Solution: Cortisol is released from the adrenal cortex and allows the body to continue to stay on high alert.