17. The Blood

Platelets are similar to erythrocytes in that both structures do not contain a _________________. Platelets are similar to leukocytes in that both their primary functions involve ________________ the body.

Which physiological response causes a reduction in blood flow immediately after a blood vessel injury?

Which of the following statements about vascular spasms is false?

Prostacyclin is a hormone that is normally active in the blood but becomes inactive when a blood vessel ruptures and hemostasis begins. Considering this, which of the following is the most likely function of prostacyclin?