The human heart
a. contracts as a result of stimuli from the sinoatrial
node.
b. contracts only as a result of nerve stimulation
from the central nervous system.
c. is activated primarily through the autonomic
nervous system.
d. rate is primarily under the control of the
atrioventricular node.
e. is independent of all nervous control.
Answer: a
You might also like to view...
Globally, what is the greatest killer of species?
a. destruction of coral reefs b. air pollution c. deforestation d. water pollution e. nuclear contamination
The infectious disease that produces spastic paralysis is ____
a. botulism
b. sarcoma c. Duchenne muscular dystrophy d. tetanus e. myotonic muscular dystrophy
Complement proteins can do all of the following except
A) enhance phagocytosis by innate immune cells by attaching to cell invaders. B) help trigger the inflammatory response. C) attack cancer and virus-infected cells after they are released by natural killer cells. D) act as chemical signals to recruit more immune cells to the site of infection.
Which of the following marks the transition from
glycolysis to the Krebs cycle? a. acetyl-CoA formation b. conversion of PGAL to PGA c. regeneration of reduced NAD+ d. oxidative phosphorylation e. substrate-level phosphorylation