The answer your looking for is D) marijuana, but in my opinion this is not factual.
Explanation:
The heart helps fight diseases by sending signals to either the pituitary gland or the microglia acts as a 1st responder once it senses an attack. it does this by boosting production of a molecule PCTR1, helps WBC's kill invading bacteria..
21: 4 and 15
22: 5
23:<span>1, 2, 3
I hope this helps</span>
Before one can calculate the target heart rate for an exercise, one must learn to calculate the resting heart rate which is then the answer. This is then the number of heart beats per minute while one is at rest and this would then measure how one's heart muscle is functioning.