Question

multiple choice question
platelets secrete vasoconstrictors that stimulate what?

• constriction of non - broken blood vessels
• constriction of broken blood vessels
• dilation of non - broken blood vessels
• dilation of broken blood vessels

Explanation:

Platelets secrete vasoconstrictors to help stop bleeding. When a blood vessel is broken, vasoconstrictors from platelets stimulate the constriction of the broken blood vessel to reduce blood flow. Vasoconstrictors cause constriction (not dilation), and the target is broken vessels (since non - broken vessels don't need this constriction to stop bleeding here). So the correct option is about the constriction of broken blood vessels.

Answer:

B. Constriction of broken blood vessels