Although the heart beats without nervous innervation, ________ can modify the heart rate
A) hormones
B) various chemicals and ions
C) impulses from the autonomic nerves
D) impulses from the autonomic nerves, hormones, and various chemicals and ions
Answer: D
You might also like to view...
The model that explains how an enzyme and substrate fit together is called the ________.
A. enzyme-substrate model B. induced-fit model C. conformational model D. lock-and-key model
When does the heart begin beating?
A. A few hours after conception B. Week 3 of development C. Week 10 of development D. Week 17 of development E. Week 20 of development
To reach threshold, the amount of sodium _______
A) exiting the cell must overcome the potassium entering B) exiting the cell must overcome the potassium exiting C) entering the cell must overcome the potassium exiting D) entering the cell must overcome the potassium entering
Which part of an antibody attaches to an antigen?
A. The variable region B. The constant region C. The hinge region D. The heavy chain