Question

3 multiple choice 1 point
what is an agonist?
it is a type of neuron in the brain.
it is a substance that blocks or impedes the effects of a neurotransmitter.
it is a substance that mimics or strengthens the effects of a neurotransmitter.
it is a part of the autonomic nervous system.

4 multiple choice 1 point
what structure of the brain allows the two hemispheres to communicate?
substantia nigra
corpus callosum
wernickes area
thalamus

Explanation:

Define agonist and contrast with antagonist

An agonist is a chemical substance that binds to a receptor and activates it to produce a biological response. In neuroscience, it mimics or strengthens the effects of a neurotransmitter. This is the opposite of Neurotransmitter Antagonists, which block or impede those neurotransmitter effects.

Identify the correct option for Question 3

Looking at the choices for Question 3:

• "It is a type of neuron in the brain" is incorrect.
• "It is a substance that blocks or impedes..." describes an antagonist.
• "It is a substance that mimics or strengthens..." correctly describes an agonist.
• "It is a part of the autonomic nervous system" is incorrect.

Analyze brain structures for hemispheric communication

To find the structure allowing communication between the two hemispheres, we evaluate the options for Question 4:

• Substantia nigra is involved in movement control and dopamine production.
• Corpus callosum is a thick band of nerve fibers connecting the left and right hemispheres.
• Wernicke's area is responsible for language comprehension.
• Thalamus acts as a sensory relay station.

Identify the correct option for Question 4

The corpus callosum is the primary structure facilitating interhemispheric communication. Therefore, the second option is correct.

Answer:

Question 3

• (A) It is a type of neuron in the brain.
• (B) It is a substance that blocks or impedes the effects of a neurotransmitter.
• (C) It is a substance that mimics or strengthens the effects of a neurotransmitter. (Correct answer)
• (D) It is a part of the autonomic nervous system.

Question 4

• (A) substantia nigra
• (B) corpus callosum (Correct answer)
• (C) Wernicke's area
• (D) thalamus