- Exam
- NEET
- Subject
- Zoology
- Chapter
- Neural Control and Coordination
NEET · Zoology · Neural Control and Coordination
How does impulse transmission occur across electrical synapses?
Options
- ABy the release of neurotransmitters
- BBy the flow of direct electrical current
- CBy the transmission of magnetic fields
- DBy the transmission of electrical impulses along a single axon
Correct answer
B. By the flow of direct electrical current
Step-by-step solution
The action potential is generated in response to a stimulus and travels along the length of the axon, transmitting the nerve impulse. The rise in permeability to Na⁺ is short-lived and is followed by a rise in permeability to K⁺. K⁺ diffuses outside the membrane, restoring the resting potential of the membrane.A synapse is a junction between two neurons that allows the transmission of a nerve impulse from one neuron to anotherNeurotransmitters are chemicals involved in transmitting impulses at chemical synapses. They bind to specific receptors on the post-synaptic membrane, opening ion channels and allowing the entry of ions to generate a new potential in the post-synaptic neuron.The membranes of pre- and post-synaptic neurons at a chemical synapse are separated by a fluid-filled space called the synaptic cleft.When an impulse arrives at the axon terminal, it stimulates the movement of the synaptic vesicles towards the membrane where they fuse with the plasma membrane and release their neurotransmitters in the synaptic cleft.