Final answer:
Epinephrine increases coronary artery blood flow and decreases the strength and rate of cardiac contractions. Therefore, the correct answer is option 3)
Step-by-step explanation:
Epi increases coronary artery blood flow and decreases the strength and rate of cardiac contractions. Therefore, the correct answer is option 3) Decreases, Increases. Epinephrine, also known as adrenaline, is a hormone released by the adrenal glands in response to stress or danger. It acts as a vasoconstrictor, meaning it narrows the blood vessels, which leads to an increase in blood pressure. Additionally, it decreases the strength and rate of cardiac contractions, which allows for better blood flow to the coronary arteries.
Epinephrine increases both coronary artery blood flow and the strength and rate of cardiac contractions, countering the assertion that it has a decreasing effect on these heart functions.
The question relates to the effects of epinephrine (Epi) on the cardiovascular system, specifically its impact on coronary artery blood flow and the strength and rate of cardiac contractions. Epinephrine, a hormone and neurotransmitter, is known to increase heart rate and the force of heart muscle contraction, which in turn increases cardiac output. This increased force and rate of contraction thereby increase coronary artery blood flow to supply the heart with more oxygen and nutrients. Concurrently, the hormone causes vasoconstriction of peripheral blood vessels, which helps to maintain or increase blood pressure, especially during a sympathetic response. Therefore, the correct answer to the question is that epinephrine increases coronary artery blood flow and also increases the strength and rate of cardiac contractions.