The SA node
a. generates excitatory signals for muscle
contraction.
b. is under voluntary control.
c. receives electrical signals from the AV
node.
d. is located in the right atrium.
e. is all of these
A
You might also like to view...
In most animals with digestive tract, digestion occurs in four successive steps, with the digested material moving by
muscular contractions through the digestive tube.
Indicate whether the statement is true or false.Which theory states that all living things are composed of cells?
A) cell theory B) Hooke's rule C) evolutionary theory D) Mendel's law
Following an endospore stain, how does one distinguish endospores from vegetative cells?
a. Vegetative cells are pink, endospores are green. b. Vegetative cells are pink, endospores are purple. c. Vegetative cells are purple, endospores are pink. d. Vegetative cells are green, endospores are pink.
The M protein of Streptococcus pyogenes
A) Protects against phagocytosis and enhances adherence. B) Is also called streptokinase. C) Is the basis for the organism belonging to Lancefield Group A. D) Protects against lysozyme damage. E) Gives rise to a zone of beta hemolysis on blood agar.