1. Neurotransmitters are chemicals that transmit signals from one nerve cell to

another. Which of the following neurotransmitters is responsible for

inhibiting the transmission of nerve signals?

A. Acetylcholine

B. GABA

C. Glutamate

D. Dopamine

Answer: B. GABA

Rationale: GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter

that helps regulate nerve signaling by reducing the activity of other

neurotransmitters.

2. Which part of the brain is responsible for processing sensory information and

generating motor responses?

A. Cerebellum

B. Hypothalamus

C. Cerebrum

D. Brainstem

Answer: C. Cerebrum

Rationale: The cerebrum is the largest part of the brain and is responsible for

higher brain functions such as sensory processing, motor control, and

speech.

3. Sleep is regulated by the circadian rhythm, which is controlled by the: