Question

Which of the following statements is correct?

• A. The new potential in a postsynaptic neuron may be either excitatory or inhibitory.
• B. Hypothalamus is the major coordination centre for sensory and motor signalling.
• C. The tracts of nerve fibres that connect two cerebral hemispheres are called corpora bigemina.
• D. Electrical synapses are more common in our neural system than chemical synapses.

Answer 1

The correct option is A The new potential in a postsynaptic neuron may be either excitatory or inhibitory.

An electrical synapse is a mechanical and electrically conductive link between two adjoining neurons that is formed at a narrow gap between the pre- and postsynaptic neurons known as a gap junction. Electrical synapses are rare in our neural system. Neurotransmitters are chemicals which are commonly involved in the transmission of impulse at the synapse. The postsynaptic potential may be excitatory or inhibitory.

Hypothalamus contains a number of centres which control body temperature and urge for eating and drinking. It also contains several groups of neurosecretory cells which secretes hormones called hypothalamic hormones.

Thalamus is a major coordinating centre for sensory and motor signalling.

The tracts of nerve fibres that connect two cerebral hemispheres are called corpus callosum.