For how many hours after donating blood should donors refrain from engaging in strenuous physical activity?

The correct response indicates that donors should avoid strenuous physical activity for 24 hours after donating blood. This recommendation is based on the physiological effects of blood donation. When a person donates blood, approximately one pint is removed, which can temporarily reduce blood volume and oxygen-carrying capacity. Engaging in strenuous activities immediately after this can lead to complications such as dizziness, fainting, or excessive fatigue, as the body may not have fully compensated for the loss yet.

Refraining from strenuous physical activity allows the body adequate time to recover and replenish the lost blood volume and red blood cells. This period also helps ensure that donors do not experience any adverse reactions. Following this guideline enhances the safety and comfort of the donor's recovery process after giving blood.