Answer is c. Epinephrine widens the air passageways in the lungs.
A pair of adrenal or suprarenal glands are the endocrine glands which are located on the top of the kidneys. Adrenal glands are covered by a connective tissue capsule. They produce a variety of hormones including epinephrine (adrenaline) and the steroids aldosterone and cortisol.
Epinephrine or adrenaline is secreted when a person is under a threat or stress. This hormone quickly responds to stress by widens the air passageways in the lungs. The lungs contain smooth muscle and epinephrine causes smooth muscles to relax. As a result the bronchioles widens that increases the breathing and enhances cellular respiration.
