What is an example of a chemical mediator? A) serotonin

B) antigens

C) pathogens

D) phagocytes

Which of the following is a health risk associated with ground-level ozone? a.cataractsb.skin cancerc.respiratory illnessd.all of the above

While it is true that stretching a "pumped" muscle will make it appear visibly smaller, it does not decrease the muscles or inhibit muscle o a size; strength o b. elasticity, growth o c. elasticity, strength o d. size; growth

Although drinking coffee is accepted in our culture, the caffeine in it is a drug. caffeine is a type of question 8 options: a) inhalant b) stimulant c) depressant d) narcotic