Marta is injected with a drug that prevents sodium (Na+) from entering into neurons in the part of the brain that controls the movement of the arms. What effect will this drug most likely have on Marta?
A) She will more her arms spasmodically.
B) She will not be able to move her arms.
C) Her arms will be numb, but she will be able to move them.
D) She will likely go into a coma.

Question

Quizplus · Accepted Answer

Sodium ions are necessary for the generation of action potentials in neurons, which are responsible for transmitting signals and controlling movement. By blocking sodium entry into neurons, the drug prevents the generation of action potentials in the arm control center of the brain, leading to a loss of voluntary control over arm movement. Therefore, Marta will not be able to move her arms.

Marta Is Injected with a Drug That Prevents Sodium (Na+)