Biology
If you stand to make your maiden speech before a large audience, your mouth dries up and heart rate increases. What brings about these changes?
Endocrine System
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Answer
When we stand to make our maiden speech before a large audience, our mouth dries up and heart rate increases and it is due to secretion of adrenaline hormone by adrenal glands. Adrenaline is the hormone which prepares the body to meet any emergency situation. Adrenaline makes the heart beat faster. At the same time, it stimulates the constriction of the arterioles of the digestive system reducing the blood supply of the digestive system which makes the mouth dry.
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Write the main function of each of the following hormones.
Hormones Functions (a) Thyroxine …………………………… (b) Adrenaline …………………………… (c) Insulin …………………………… (d) Glucagon …………………………… (e) Vasopressin …………………………… Name the hormones responsible for the given functions.
Functions Hormones (a) Contraction of uterine muscles during child birth …………………………… (b) Maintenance of corpus luteum …………………………… (c) Milk formation and secretion …………………………… (d) Development of external sex characters in males …………………………… (e) Stimulation of sympathetic nervous system ……………………………. Given below is a table designed to give the names of the glands, the hormones produced, their chief functions, the effects of over secretion and under secretion in respect of thyroid, pituitary and pancreas. Fill up the blanks 1-13.
S.No. Source Gland cells Hormone produced Chief function Effect of oversecretion Effect of undersecretion 1. (1) -------- Thyroxine (2) ---- (3)---- (4)--- 2. Beta cells of Islets of Langerhans (5) ------ Promotes glucose utilisation by the body cells (6) ---- (7) ------ 3. (8) -------- Growth hormone (9) ---- (10) --- Dwarfism 4. (11) ------ Vasopressin Increases reabsorption of water from kidney tubules (12) ------- (13) ------ Complete the following table by filling in the blanks numbered 1 to 7.
Gland Hormone secreted Effect on body (1) ----------- (2) ------- Regulates basal metabolism Pancreas ("beta" cells) (3) ------- Controls blood sugar (4) ------------ (5) -------- Increases heart beat (6) ------------ Thyroid stimulating hormone (7) ------------