Tag: generation of nerve impulse

Nodes of Ranvier are the periodic gaps in the myelin sheath along the length of an axon where the axonal membrane is exposed to the extracellular fluid.

The diencephalon, which includes the hypothalamus, plays a critical role in maintaining homeostasis by regulating body temperature, thirst, hunger, and endocrine functions.

Broca's area is located in the frontal lobe, not the temporal lobe. Wernicke's area, the auditory area, and the olfactory area are all associated with the temporal lobe.

The Foramen of Monro (interventricular foramen) connects the lateral ventricles (paracoel) to the third ventricle (diocoel).

Synaptic delay is the time required for the release of neurotransmitters, their diffusion across the synaptic cleft, and the binding to receptors on the postsynaptic membrane, typically lasting about 0.5 ms.

Repolarization occurs when sodium channels close and potassium channels open, allowing K+ to flow out of the cell to restore the negative resting potential.

In the resting stage, the neuronal membrane is much more permeable to potassium ions (K+) than to sodium ions (Na+), which helps maintain the resting potential.

The myelin sheath acts as an electrical insulator, preventing ion leakage and allowing saltatory conduction, which significantly increases the speed of nerve impulse transmission.

Unlike action potentials, which are 'all-or-none', graded potentials vary in amplitude and duration depending on the strength of the stimulus.

Electrical synapses allow for direct ion flow between neurons via gap junctions, making transmission significantly faster than the chemical process of releasing and binding neurotransmitters.