If the SA node fails, the next pacemaker to fire will be the: ...

[fagboi]

If the SA node fails, the next pacemaker to fire will be the:
 
  a. AV node.
  b. AV junction.
  c. bundle of His.
  d. Purkinje network.

Question 2

Which of the following chemical agents binds to acetylcholinestrase inhibiting the breakdown of acetylcholine at autonomic nervous system synapses?
 
  a. Chlorine
  b. Sarin
  c. Phosgene
  d. Gamma radiation

[brbarasa]

Answer to Question 1

B

Answer to Question 2

b
Rationale: a. Chlorine is a chocking agent which causes pulmonary destruction.
b. Correct. Sarin is an organophosphate that interacts with acetylcholinestrase .
c. Phosgene is a chocking agent which causes pulmonary destruction.
d. Gamma radiation is a radiological agent. Its effects are widespread.

[fagboi]

Thanks for the timely response, appreciate it

[Dnite]

Excellent