In the human body, the 'Islets of Langerhans' are found in the: MCQ with Answer and Explanation

In the human body, the 'Islets of Langerhans' are found in the:
A. Spleen
B. Pancreas
C. Liver
D. Kidneys
Answer: Option B
Solution (By JKSSB Mock Tests)
The Islets of Langerhans are the endocrine (hormone-producing) portions of the pancreas. They are clusters of cells scattered throughout the pancreatic tissue, comprising about 1-2% of the pancreas's mass. They contain several cell types, primarily alpha cells (secreting glucagon), beta cells (secreting insulin), delta cells (secreting somatostatin), and F cells (secreting pancreatic polypeptide). These hormones are crucial for regulating blood glucose levels.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
Which gland produces the hormone melatonin?
A. Thymus gland
B. Thyroid gland
C. Adrenal gland
D. Pineal gland

Correct Answer: Option D


Explanation:
The pineal gland, located in the brain, secretes melatonin, which regulates circadian rhythms and the sleep-wake cycle. Its secretion increases in darkness.

This question belongs to: Science Biology
Question #2
The fossil Archaeopteryx provides evidence for the evolutionary link between:
A. Reptiles and mammals
B. Reptiles and birds
C. Fish and amphibians
D. Amphibians and reptiles

Correct Answer: Option B


Explanation:
Archaeopteryx lithographica, a Jurassic fossil, exhibits features of both reptiles (teeth, bony tail, claws) and birds (feathers, wings), supporting the theory that birds evolved from theropod dinosaurs. It is a classic transitional fossil. Tiktaalik links fish and amphibians, cynodonts link reptiles and mammals.

This question belongs to: Science Biology
Question #3
The hormone that stimulates the reabsorption of sodium and water in the kidney is:
A. Antidiuretic hormone (ADH)
B. Aldosterone
C. Natriuretic peptide
D. Renin

Correct Answer: Option B


Explanation:
Aldosterone, secreted by the adrenal cortex, increases sodium reabsorption (and water follows) and potassium secretion in the distal tubule and collecting duct. ADH increases water reabsorption only. Renin is an enzyme, natriuretic peptides inhibit sodium reabsorption.

This question belongs to: Science Biology