Question 1

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

Accepted Answer

Correct Option: DExplanation:Melatonin is a hormone secreted by the pineal gland in the brain. Melatonin, often referred to as the sleep hormone, is a central part of the body's sleep-wake cycle. Its production increases with evening darkness, promoting healthy sleep and helping to orient our circadian rhythm.

Question 2

Which of the following does not favour the formation of large quantities of dilute urine?

Accepted Answer

A. Renin is involved in RAAS or Renin Angiotensin Aldosterone System. Renin is secreted by juxtaglomerular cells. It activates plasma protein angiotensin which is converted to angiotensin-I. Angiotensin-I is further converted to angiotensin-II which causes increased reabsorption of water and NaCl in the proximal convoluted tubule and this results in the formation of concentrated urine.B. Atrial natriuretic factor works opposite to RAAS and inhibits renin secretion from juxtaglomerular cells. This inhibits NaCl and water reabsorption and results in the formation of diluted urine.C. Alcohol suppresses the secretion of ADH or antidiuretic hormone. This results in inhibition of reabsorption of water in the distal convoluted tubule and results in the formation of diluted urine.D. Caffeine acts as a diuretic and decreases water reabsorption from the nephrons and thus, more diluted urine is produced.Hence, it's Renin that does not favour the formation of large quantities of dilute urine instead produces concentrated urine.So, the correct answer is 'Renin'.

Question 3

Which of the following glucose transporters is insulin-dependent?

Accepted Answer

GLUT-IV glucose transporter is insulin-dependent and is responsible for most of the glucose transport into muscles and adipose cells in anabolic conditions. Whereas GLUT-I is insulin-independent and is widely distributed in different tissues.So, the correct answer is 'GLUT IV'.

Question 4

Identify the hormone with its correct matching of source and function.

Accepted Answer

Oxytocin, produced by posterior pituitary gland functions in parturition.Melatonin regulates sleep and wake cycles and is secreted by ventricular walls. Melatonin is a hormone from the pineal gland that helps regulate biological rhythms such as sleep and wake cycles. In other words, it's melatonin that directs your internal clock - the one that allows you to wake up about the same time every morning without an alarm clock.Progesterone secreted by corpus luteum is steroid hormone involved in the menstrual cycle, pregnancy and embryogenesis.Atrial natriuretic factor  is a powerful vasodilator and a protein hormone, secreted by heart muscle cells.Thus, the correct answer is option B, 'Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle'.

Chemical Control And Integration

Biology
5446 Views

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

Which of the following does not favour the formation of large quantities of dilute urine?

Which of the following glucose transporters is insulin-dependent?

Identify the hormone with its correct matching of source and function.

Chemical Control And Integration

Biology 5446 Views

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone

Which of the following does not favour the formation of large quantities of dilute urine?

Which of the following glucose transporters is insulin-dependent?

Identify the hormone with its correct matching of source and function.

Biology
5446 Views