Respuesta :
Your blood pressure is 68/38 and you fainted after donating a unit of blood. You are likely experiencing low preload from loss of blood volume. you understand preload to mean the amount of venous return to the heart.
After giving blood, some people may feel exhausted or lightheaded, dizzy, or nauseous. This is a result of the brief drop in blood pressure. When feeling dizzy, one should sit down and lower their head till it is lower than their heart.
Adverse incidents could frighten the donors and heighten worry. Although some evidence suggests that anxiety rises before and during blood donation, it is still not quite apparent what causes such a stress response. Stress responses are a fairly regular occurrence.
Most people's hemoglobin levels return to normal 6 to 12 weeks after a donation. We, therefore, request that donors wait for a minimum of 12 weeks between gifts.
To learn more about blood donation refer to:
https://brainly.com/question/13961448
#SPJ4
