What is the effect of norepinephrine on the heart?
A. it decreases the rate and strength of contraction
B. it increases the rate and strength of contraction
C. it decreases the amount of blood pumped per minute
D. it has no effect on the heart
Answer: B) It increases the rate and strength of contraction.
Feedback: Norepinephrine is released by sympathetic postgangionic fibers.
You might also like to view...
Which of the following is known as "center-seeking" force?
A. momentum B. acceleration C. centrifugal force D. centripetal force
The ________ collects blood from the entire small intestine and two-thirds of the large intestine
A) celiac trunk B) hepatic portal vein C) splenic vein D) gastric vein E) superior mesenteric vein
List 3 breeds of fish that bear live young
What will be an ideal response?
Osteoporosis increases the risk of
A. bone spurs. B. bone fractures. C. bone cancer. D. anemia.