The Nervous System Overview

overview

What is the nervous system?

The nervous system is the master controller of communication in the body, leveraging electrical and chemical signals.

What are the main functions of the nervous system?

The nervous system processes information, integrates responses, and controls the muscles and glands.

What are the two main parts of the nervous system?

The central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which connects the CNS to the body.

What are neurons?

Neurons are the nerve cells responsible for transmitting electrical signals.

What are neuroglia?

Neuroglia are the supporting cells in the nervous system that provide support and protection for neurons.

What is a synapse?

A synapse is a junction that allows information transfer between neurons or from a neuron to an effector cell.

What is an action potential?

An action potential is a rapid change in the membrane potential of a neuron that occurs when a stimulus reaches a threshold.

What are neurotransmitters?

Neurotransmitters are chemical messengers released by neurons to communicate with other neurons or cells.

What are the two types of neurotransmitters?

Neurotransmitters can be classified as excitatory or inhibitory.

What is the role of acetylcholine in the nervous system?

Acetylcholine is a neurotransmitter that stimulates muscle contraction at the neuromuscular junction.

What effect does Botox have on neurotransmission?

Botox blocks the release of acetylcholine, preventing muscle contraction.

What are endorphins?

Endorphins are neuropeptides that act as natural painkillers and are linked to feelings of pleasure.

What is the autonomic nervous system?

The autonomic nervous system controls involuntary functions like heart rate, digestion, and respiratory rate.

What are the two divisions of the autonomic nervous system?

The sympathetic (fight or flight) and parasympathetic (rest and digest) divisions.

What are the components of the nervous system?

The nervous system is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS connects the CNS to the rest of the body.

What is the role of sensory neurons?

Sensory neurons transmit sensory information from the body to the CNS, relaying messages to interpret environmental signals.

What is the role of motor neurons?

Motor neurons transmit impulses from the CNS to effector organs like muscles and glands, eliciting a response or action.

What are the types of neuroglia in the CNS?

The types of neuroglia in the CNS include astrocytes, microglia, ependymal cells, and oligodendrocytes, each with specific support and protective roles for neurons.

What is the difference between afferent and efferent signals?

Afferent signals are incoming signals to the CNS for processing, while efferent signals are outgoing responses sent from the CNS to the body to act.

What is a motor unit?

A motor unit consists of a motor neuron and all the muscle fibers it innervates, coordinating muscle contraction.

How do neurotransmitters facilitate communication between neurons?

Neurotransmitters are released from the pre-synaptic neuron and bind to receptors on the post-synaptic neuron, altering its membrane potential and instigating a response.

What are the two types of synapses?

The two types of synapses are electrical and chemical, with chemical synapses being the most common type, utilizing neurotransmitters for signal transmission.

What role do astrocytes play in the CNS?

Astrocytes help maintain the blood-brain barrier, regulate nutrient exchange, and repair neural tissues.

What effect do drugs have on neurotransmitter function?

Drugs can increase or decrease neurotransmitter release, block receptors, or inhibit the reuptake of neurotransmitters, affecting communication in the nervous system.