Diabetes Mellitus & Glucose Loss — NEET Biology
✅ Asked in NEET 2020A person shows symptoms of high blood sugar, frequent urination and thirst. Which hormone is likely deficient? (NEET 2020)
A person shows symptoms of high blood sugar, frequent urination and thirst. Which hormone is likely deficient? (NEET 2020)
Answer & NCERT explanation
Correct answer: D — Insulin
These symptoms (high blood sugar, frequent urination, thirst) indicate diabetes mellitus caused by insulin deficiency. Insulin normally promotes glucose uptake by cells. Without adequate insulin, glucose accumulates in blood (hyperglycemia), excess glucose is excreted in urine causing frequent urination, and this leads to dehydration causing excessive thirst. Glucagon raises blood sugar, so its deficiency wouldn't cause these symptoms.
Read more NCERT concept on the PYQ
Prolonged hyperglycemia leads to a complex disorder called diabetes mellitus which is associated with loss of glucose through urine and formation of harmful compounds known as ketone bodies. Diabetic patients are successfully treated with insulin therapy.
Diabetes mellitus is a metabolic disorder where prolonged hyperglycemia (high blood sugar) causes glucose to be lost through urine instead of being reabsorbed. This occurs when blood glucose exceeds the renal threshold (typically >180 mg/dL), and the kidneys cannot reabsorb all the filtered glucose. Students often confuse glycosuria (glucose in urine) with kidney damage—it's actually a sign of uncontrolled blood glucose. Additionally, understand that diabetic patients cannot properly use glucose due to insulin deficiency or resistance, leading to ketone body formation as an alternative fuel source. Remember: insulin therapy restores glucose homeostasis and prevents complications like ketoacidosis.
What does NCERT say about Prolonged hyperglycemia leads to?
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.