Islets of Langerhans & Pancreatic Hormones — NEET Biology
📚 Practice ConceptPancreas is a composite gland which acts as both exocrine and endocrine gland. The endocrine pancreas consists of 'Islets of Langerhans'. There are about 1 to 2 million Islets of Langerhans in a normal human pancreas representing only 1 to 2 per cent of the pancreatic tissue. The two main types of cells in the Islet of Langerhans are called α-cells and β-cells. The α-cells secrete a hormone called glucagon, while the β-cells secrete insulin.
Assertion (A): The Islets of Langerhans contain two main types of hormone-secreting cells. Reason (R): The α-cells secrete insulin while the β-cells secrete glucagon.
View solution & NCERT explanation
Correct answer: C — If assertion is true but reason is false.
NCERT confirms “The two main types of cells in the Islet of Langerhans are called α-cells and β-cells” making the Assertion true. However, NCERT explicitly states “The α-cells secrete a hormone called glucagon, while the β-cells secrete insulin” - the Reason swaps these hormones making it false. This is a highly plausible error students commonly make.
What does NCERT say about Pancreas composite gland which?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.