Question

Hormone that stimulates heart beat is
A. Thyroxine
B. Adrenaline
C. Glucagon
D. Gastrin

Answer 1

Initially heart beats originate from sinoatrial nodes. It is called the natural pacemaker of the heart. At first impulse starts at the SA node located at the right atrium. Electrical activity spreads on the heart wall and produces the contraction. Sympathetic nervous system is used to accelerate the heart rate and the parasympathetic nervous system is used to slow down the heart rate. Adrenal medulla stimulates the heartbeat.

Complete answer:
Option A: Thyroxine hormone is produced by the thyroid gland. It secretes thyroxine to the bloodstream. It is important in the digestion process, heart and muscle function, brain development and maintenance of the bone. Excess thyroxine may cause the increasing heart beats and produce the abnormal heartbeat rhythms. Option A is incorrect.
Option B: Adrenaline hormone is produced by adrenal glands. This hormone is used to increase the heart rate, increase blood pressure, expand the air passages of lungs and enlarge the pupil of the eye. It maintains the blood glucose level. It triggers the fight or flight response in the body. It makes a decision immediately and initiates a quick response. It also stimulates the heart beat. Option B is correct.
Option C: Glucagon is also called the glucoregulatory peptide hormone. It counteracts the action of insulin by the stimulation of hepatic glucose production. It also increases the blood glucose level. It will act on the liver to maintain the glucose level in blood. It prevents the rate of glucose doesn't getting low. Option C is incorrect.
Option D: Gastrin hormone is produced by the G cells of the lining cell in the stomach. It stimulates acid secretion from gastric parietal cells. It also stimulates the mucosal growth in acid secreting places in the stomach. This hormone performs acid secretion during or after meals. Option D is incorrect.

Therefore, Option B is the correct answer.

Note:
Adrenaline hormone triggers the blood vessels to contract to redirect blood towards the muscle groups, heart and lungs. Adrenaline hormone increases the blood rate. This hormone is also acting as the pain resistance. Vision power is getting clear because of the adrenaline hormone. It reduces the pain and reduces the risk in breathing. This hormone also increases the immune system of the body. During the stress within the minute quickly this hormone sends the response to the particular place.