Read the following statements.
A) Association of cerebral cortex responsible for memory and communication are either clearly sensory or clearly motor in function.
B) The ionic gradients across the resting axonal membrane are maintained by the sodium-potassium pump which actively transports 3 Na⁺ outwards for 2 K⁺ into the cell.
C) A reflex action occurs without conscious effort or thought and does not require the involvement of central nervous system.
D) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
Which of the above statements are true?

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A and B

B and D

C and D

B and C

answer is D.

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Detailed Solution

The cerebral cortex contains motor areas, sensory areas and large regions that are neither clearly sensory nor motor in function. These regions called as the association areas are responsible for complex functions like intersensory associations, memory, and communication. A reflex action occurs without conscious effort or thought and requires the involvement of central nervous system.

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