Question 1 What chemical is released from the adrenal medulla in stressful situa

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?