Which of the following statements is false?

a. Veins lack smooth muscle and elastic fibers.
b. Parasympathetic nervous system stimulation
decreases heart rate.
c. Adjustments to blood flow result from stimuli
from the nervous and endocrine systems and
from changes in local chemicals.
d. Thrombin is an enzyme that acts on fibrinogen.
e. Hemostasis stops bleeding.


Answer: a

Biology & Microbiology

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