2023 source guide · Biology

NEET 2023 Biology Human Physiology Questions

Use this page to connect the official 2023 paper with current Biology practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 639 verified questions →Check official NTA archive ↗

What to master

integrated respiratory, circulatory, excretory, neural, endocrine and movement physiology.

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 4/5

When adrenaline binds to its receptor on a liver cell membrane, which sequence correctly represents the signal transduction events that follow?

A. Adenyl cyclase is activated first, after which the G-protein couples the receptor to the enzyme
B. Adrenaline diffuses into the nucleus and directly switches on the genes coding for glycogen-splitting enzymes
C. The receptor itself converts ATP to cyclic AMP without any G-protein participation
D. Hormone–receptor binding activates the G-protein, which turns on adenyl cyclase; ATP is converted to cAMP, and cAMP activates protein kinases that trigger glycogen breakdown

Example 2 · difficulty 3/5

Atrial natriuretic factor (ANF), released by the walls of the atria when blood volume and pressure rise, restores blood pressure towards normal mainly by:

A. Causing dilation of blood vessels and promoting excretion of sodium and water in urine
B. Stimulating the juxtaglomerular cells to secrete more renin
C. Enhancing reabsorption of sodium ions in the distal tubules
D. Promoting aldosterone secretion from the adrenal cortex

Example 3 · difficulty 1/5

Aquatic amphibians and most bony fishes are ammonotelic. The chief reason ammonia can serve as their primary nitrogenous waste is that it:

A. is insoluble in water and can be stored harmlessly in tissues
B. requires very little water for its elimination from the body
C. is highly soluble in water and diffuses readily across general body surfaces
D. is converted into urea by the liver before being excreted

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

Breathing and Exchange of Gases →Body Fluids and Circulation →Excretory Products and their Elimination →Locomotion and Movement →Neural Control and Coordination →Chemical Coordination and Integration →

Frequently asked questions

Are these official NEET 2023 Biology Human Physiology PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2023 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.