Question 1

What chemical is released from the adrenal medulla in stressful situations?

norepinephrine

acetylcholine

hydrogen ions

Testosterone

Question 2

What does a pulse measure?

the expansion and recoil of an artery

the expansion and recoil of a vein

the expansion and recoil of a capillary

the expansion an recoil of a lymphatic vessel

Question 3 

Which substance produced by the kidneys, by a leukocyte, helps prevent unnecessary blood clotting?

heparin

histamine

antibodies

serotonin

Question 4

What is the term for blood vessels that provide a "detour" in the circulation of the heart's blood supply?