Question

question 4 of 20 : select the best answer for the question. 4. how are messages carried throughout the human body from the brain to the nervous system?
a. active transport
b. chemical channels
c. electrical signals
d. magnetic synapses
mark for review (will be highlighted on the review page)
<< previous question
next question >>

Explanation:

To determine how messages are carried from the brain to the nervous system, we analyze each option:

• Option A: Active transport is a cellular process for moving molecules across membranes, not for neural messaging.
• Option B: There's no term "chemical channels" for neural signal transmission; synapses use chemical messengers (neurotransmitters) but the main signal within neurons is electrical.
• Option C: Neurons transmit messages as electrical signals (action potentials) along their axons, and between neurons, electrical signals trigger chemical (neurotransmitter) release at synapses. This is the correct mechanism for carrying messages in the nervous system.
• Option D: Magnetic synapses do not exist; synapses are either electrical (rare, direct ion flow) or chemical (neurotransmitter - mediated), and magnetic forces are not involved in neural signaling.

Answer:

C. Electrical signals