The period of ventricular contraction in the heart is called systole

What is the first step in coagulation that occurs after vascular trauma?

a. Vasoconstriction at the site of injury b. Platelet adhesion to collagen c. Platelet activation and shape change d. Platelet aggregation to more platelets

The seroconversion rate is where the vaccine causes the development of immunity

a. True b. False Indicate whether the statement is true or false