The only ion(s) that can diffuse across a neuron's membrane when the neuron is at rest is (are):
sodium.
potassium.
proteins.
phosphate.
The Correct Answer is B
A. sodium: While some sodium leaks in, the resting membrane is significantly less permeable to sodium than to potassium.
B. potassium: The resting neuronal membrane has "leaky" channels that are specifically permeable to K + , allowing it to diffuse out down its concentration gradient.
C. proteins: Intracellular proteins are large, negatively charged molecules that cannot cross the membrane.
D. phosphate: Like proteins, phosphate ions are trapped inside the cell and cannot diffuse across the resting membrane.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. kyphosis: Kyphosis is an exaggerated outward (posterior) curvature of the thoracic spine, often called "hunchback."
B. scoliosis: Scoliosis is an abnormal lateral (side-to-side) curvature of the spine.
C. Scheuermann disease: While this disease causes kyphosis in adolescents, the question asks for the name of the condition of the curvature itself.
D. lordosis: Lordosis is an exaggerated inward (anterior) curvature, typically found in the lumbar or cervical spine ("swayback").
Correct Answer is C
Explanation
A. usually involves the endocrine or nervous system: This describes extrinsic control, where signals come from outside the specific organ.
B. operates at the cellular level: While it involves cells, intrinsic control is specifically defined by an organ or tissue regulating itself.
C. is sometimes called autoregulation: Intrinsic control refers to "built-in" mechanisms within an organ that allow it to adjust its function without outside help (e.g., blood flow regulation within the heart).
D. operates at the system or organism level: This describes extrinsic or systemic regulation.
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