ATI RN
Questions About the Nervous System Questions
Question 1 of 5
A neuroglial cell having a star shape that participates in brain development and the metabolism of neurotransmitters, helps form the blood-brain barrier, helps maintain the proper balance of K+ for generation of nerve impulses, and provides a link between neurons and blood vessels.
Correct Answer: C
Rationale: Astrocytes are star-shaped CNS glia supporting neurotransmitter metabolism, blood-brain barrier, K+ balance, and neuron-vessel links. Neuroblastoma is a tumor, axon terminals are neuron parts, and sympathetic is a system.
Question 2 of 5
Neuron that conducts impulses from the brain toward the spinal cord or out of the brain and spinal cord into cranial or spinal nerves to effectors that may be either muscles or glands.
Correct Answer: A
Rationale: Motor neurons (efferent) carry signals from the CNS to effectors (muscles, glands). Synapse is a junction, interneurons connect neurons, and sensory neurons are afferent.
Question 3 of 5
A graded potential that makes the membrane potential more negative, inhibiting an action potential.
Correct Answer: B
Rationale: A hyperpolarizing graded potential (e.g., IPSP) makes the membrane more negative, reducing the likelihood of an action potential. Depolarizing is excitatory, others are incorrect terms.
Question 4 of 5
The effectors of the body include
Correct Answer: C
Rationale: Effectors are tissues that respond to neural signals, such as glands (secreting hormones) and muscles. Cranial nerves and spinal cord are neural, and the brain is CNS.
Question 5 of 5
In an analogy, if an organism is a book and a cell is an individual word, then organs are
Correct Answer: A
Rationale: Organs are like chapters, each a major functional unit contributing to the organism (book). Cells are words, tissues are sentences, and organ systems are sections.