ATI RN
Questions About Nervous System Questions
Question 1 of 5
What blood vessel enters the cranium to supply the brain with fresh, oxygenated blood?
Correct Answer: C
Rationale: The internal carotid artery (C) enters the cranium via the carotid canal, supplying the brain. The common carotid (A) branches into it but doesn’t enter, jugular vein (B) drains blood, and aorta (D) is systemic. C is correct.
Question 2 of 5
What type of glial cell provides myelin for the axons in a tract?
Correct Answer: A
Rationale: Oligodendrocytes provide myelin for axons in the central nervous system (CNS), where tracts are located. Schwann cells myelinate axons in the peripheral nervous system (PNS), astrocytes support neurons, and satellite cells support cell bodies in the PNS.
Question 3 of 5
How long does all the signaling through the sensory pathway, within the central nervous system, and through the motor command pathway take?
Correct Answer: C
Rationale: Neural signaling, including sensory input, CNS processing, and motor output, occurs in a fraction of a second (milliseconds) due to the speed of action potentials and synaptic transmission.
Question 4 of 5
Which of the following is probably going to propagate an action potential fastest?
Correct Answer: D
Rationale: A thick, myelinated axon propagates action potentials fastest due to saltatory conduction (myelin) and lower resistance (thickness). Myelination speeds conduction more than diameter alone.
Question 5 of 5
Which is the largest branch of the internal carotid artery?
Correct Answer: C
Rationale: The middle cerebral artery (MCA) is the largest branch of the internal carotid artery, supplying a significant portion of the cerebral cortex (e.g., lateral aspects). The ophthalmic artery is smaller, and the anterior cerebral and striate arteries are not as large.