Which of the following is true about the stress hormone, cortisol? Select one:

a.
It is produced by the cardiovascular system.

b.
People with PTSD do not produce cortisol.

c.
In excess, it can boost the immune system.

d.
In excess, it can suppress the immune system.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.