Nervous system chpt 4

What are the functions of the parasympathetic and sympathetic nervous systems?

The parasympathetic system controls "rest and digest" responses, while the sympathetic system controls "fight or flight" responses

What are the components of a neuron?

Neurons consist of a cell body (soma), dendrites (receive signals), and an axon (transmits signals).

What is a synapse?

A synapse is the junction where neurons communicate with each other or with other cells using neurotransmitters.

What is the difference between sensory and motor neurons?

Sensory neurons carry signals from sensory receptors to the CNS, while motor neurons transmit signals from the CNS to muscles or glands.

What is a motor unit?

A motor unit consists of a single motor neuron and all the muscle fibers it controls.

What is an action potential, and how is an impulse conducted?

An action potential is an electrical signal that travels along the axon. The impulse is conducted when the neuron depolarizes, sending the signal along the axon to the synapse.

What is the function of the myelin sheath?

The myelin sheath insulates the axon, allowing faster transmission of electrical signals.

What is the size principle in motor unit recruitment?

The size principle states that smaller motor units are recruited first during muscle contraction, followed by larger units as the demand for force increases.

What are the training adaptations in the nervous system?

Training adaptations include improved motor unit recruitment, enhanced synaptic efficiency, and better coordination of muscle movements

How does the body maintain homeostasis?

The nervous and endocrine systems regulate physiological processes to maintain stable internal conditions like temperature, pH, and glucose levels.

What is the function of the nervous system in initiating movement?

The nervous system sends signals through motor neurons to muscles, causing them to contract and initiate movement.

What does "organization" refer to in the context of the nervous system?

Organization refers to how the nervous system is structured, with the central nervous system (CNS) controlling integration and the peripheral nervous system (PNS) handling sensory input and motor output.

What is the difference between autonomic and sensory-somatic nervous systems?

The autonomic nervous system controls involuntary actions (e.g., heart rate, digestion), while the sensory-somatic nervous system controls voluntary actions (e.g., muscle movement).

Entry of nerve impulse , the channel, exiting point

Dendrites,axon,synapse terminal