Understanding the Nervous System

Neurons: The Basic Units

The nervous system’s fundamental unit is the neuron (nerve cell). Neurons transmit information via electrical and chemical signals.

A typical neuron consists of a cell body, dendrites (receiving signals), and an axon (transmitting signals). The synapse is where neurons communicate.

Neuron Structure: Cell Body + Dendrites + Axon; Synapse = Junction for Signal Transmission

Action Potentials – Electrical Signaling

Neurons transmit signals through action potentials, rapid changes in electrical potential across the cell membrane.

This process involves depolarization (movement of sodium ions) and repolarization (movement of potassium ions), generating an impulse that travels along the axon.

Vm = R * I; Vm = Membrane Potential, R = Resistance, I = Current

Neurotransmitters – Chemical Communication

When an action potential reaches the synapse, it triggers the release of neurotransmitters.

These chemicals cross the synaptic cleft and bind to receptors on the postsynaptic neuron, continuing or inhibiting the signal. Examples include glutamate and GABA.

Neurotransmitter Release: Dependent on Calcium influx and vesicle fusion

Brain Regions & Function

The brain is organized into distinct regions, each specializing in particular functions. The cerebral cortex controls higher-level thinking.

The cerebellum coordinates movement, while the brainstem regulates vital functions like breathing and heart rate.

No relevant equation/mechanism – This section focuses on anatomical organization.

Frequently asked questions

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