Neuroscience Cheat Sheet: Neurons and Signaling

This cheat sheet covers the fundamental principles of neuronal communication, including the structure of neurons, types of signaling, action potentials, synaptic transmission, and the role of the nervous system in maintaining homeostasis.

Core Principles

• Neurons are specialized cells that transmit information via electrical and chemical signals.
• Action potentials are rapid, transient changes in membrane potential that propagate along axons.
• Synaptic transmission allows neurons to communicate with each other or with target cells.
• The nervous system regulates bodily functions to maintain a stable internal environment (homeostasis).
• Neurotransmitters are chemical messengers that mediate communication at synapses.
• Ion channels and pumps are crucial for establishing and maintaining membrane potentials.
• Different types of neurons and receptors are specialized for various sensory and motor functions.
• The nervous system is broadly divided into central and peripheral components.

Key Terms

• Neuron: A nerve cell that transmits information through electrical and chemical signals.
• Action Potential: A brief, all-or-none electrical impulse that travels down an axon.
• Synapse: The junction between two neurons, or between a neuron and a target cell, where information is transmitted.
• Neurotransmitter: A chemical messenger released from a neuron that affects the activity of a postsynaptic cell.
• Membrane Potential: The electrical potential difference across the plasma membrane of a cell.
• Homeostasis: The maintenance of a stable internal environment in the body.
• Receptor: A protein molecule that receives chemical signals from outside a cell.
• Axon: The long projection of a neuron that typically conducts electrical impulses away from the neuron's cell body.
• Dendrite: A short, branched extension of a nerve cell, along which impulses are received from other neurons.