ATI RN
Nervous System Questions Questions
Question 1 of 5
Which type of receptor is found in the heart?
Correct Answer: B
Rationale: Beta receptors (β₁) in the heart increase rate and force when stimulated by norepinephrine/epinephrine. Alpha receptors are vascular, nicotinic are ganglionic, GABA is CNS.
Question 2 of 5
The rectus eye muscle capable of causing the eyeball to turn laterally in a horizontal plane is innervated by which cranial nerve?
Correct Answer: B
Rationale: The lateral rectus, innervated by the abducens nerve (VI), moves the eye laterally. Oculomotor (III) and trochlear (IV) move other muscles.
Question 3 of 5
A transmitter substance released into the synaptic cleft is:
Correct Answer: B
Rationale: Acetylcholine is a key neurotransmitter released into the synaptic cleft. Cholinesterase degrades it, ATP may co-release, RNA is not a transmitter.
Question 4 of 5
The presence of myelin gives a nerve fiber its:
Correct Answer: B
Rationale: Myelin, a lipid-rich sheath, gives axons a white appearance and speeds impulse transmission via saltatory conduction. Gray matter lacks myelin, regeneration is PNS-specific (Schwann cells).
Question 5 of 5
The junction between the two neurons is called:
Correct Answer: C
Rationale: A synapse is the junction between neurons where signals pass chemically or electrically.