Practice question

MCQ

Question

Endothelial cells release NO upon stimulation by acetylcholine or serotonin, leading to vascular smooth muscle relaxation. NO is rapidly inactivated by hemoglobin. Which statements are correct?

Options

Choose one · Correct answer highlighted

A and B A and C C and D Correct B and D

Explanation

C and D, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Share this question

Discussion

Comments

0 comments

Please log in to join the discussion.

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

Related blogs

Guides and insights connected to this topic

Genetic 25 Sep 2026

Losing the Y Chromosome: Structure, Functions, Degeneration and Effects of Loss of Y Chromosome (LOY)

Discusses Y chromosome structure, its evolutionary degeneration, and health impacts of loss of Y (LOY) in men.

Cell Biology 31 Aug 2026

Endothelial Cells: Types, Structure, Functions and Disorders

Learn about endothelial cells, their types, structure, functions, and disorders caused by endothelial dysfunction.

Biology XII Lab Manual 10 Oct 2026

Experiment 16: Flash Cards / Models / Specimens Showing Examples of Homologous and Analogous Organs

AIM To study homology and analogy with the help of models/charts of animals and models/charts/specimens of plants. PRINCIPLE Homologous organs are functionally dissimilar but anatomically or structurally similar. Different modes of life have modified the organs to enable survival...