What event occurs first in the process of hemostasis?
a. Platelets stick together.
b. Platelets form a plug.
c. An enzyme cascade activates thrombin.
d. The injured vessel constricts.
e. Fibrin forms a clot.
d
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The incidence of HIV among hemophiliacs and transfusion recipients has remained constant since 1994
Indicate whether the statement is true or false.
A taproot system lacks
(a) lateral roots. (b) a taproot. (c) both of the above. (d) none of the above.
. Imagine that you have been bitten by a poisonous snake with neurotoxic venom. Thankfully, you are rushed to the emergency room of a local hospital, where you receive antivenom. Your condition subsequently returns to normal. Before your release, your physician chastises you for not being more careful. He informs you that you were within minutes of not being able to breathe as the result of the venom's effect on the nervous control of your breathing. As a biology student, you consider this carefully, and hypothesize that your breathing would have stopped because the venom would cause
A. your trachea to collapse. B. your lungs to collapse. C. your diaphragm to become inactive. D. your blood to lose oxygen.
A major problem for parasites is gaining access to and escaping from the host
Indicate whether the statement is true or false