Central nervous system

Peripheral nervous system

Autonomic nervous system

Somatic nervous system

Sensory, motor, interneaurons

Sympathetic and parasympathetic

Parts and functions of neuron

Reflex arc

Action potential

Resting potential

Threshold levels

Synapse

Neurotransmitters

Parts and functions of brain

Sensory adaptation

Parts and functions of eye

Rhodospin

Afterimage

Focusing the image

Vision defects

Parts and functions of the ear

Excessive noise mechanism

Dynamic and static equilibrium

Types of hearing loss

Homeostasis

Negative and positive feedbacks

Endocrine glands

Diabetes mellitus

Long and short term stress

Metabolism

Blood sugar

Blood calcium

Water and ion balance

RAAS

The nervous system is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS comprises the brain and spinal cord, while the PNS includes all other neural elements. The autonomic nervous system controls involuntary functions and consists of the sympathetic (fight or flight) and parasympathetic (rest and digest) systems. The somatic nervous system governs voluntary movements. Neurons are the basic units of the nervous system, consisting of sensory, motor, and interneurons. The reflex arc is a neural pathway that mediates a reflex action. Action potentials are the electrical impulses that transmit signals along neurons, whereas resting potential refers to the baseline state of a neuron. Synapses are the junctions where neurotransmitters transmit signals between neurons. The brain has various parts that perform specific functions, and sensory systems adapt to stimuli to maintain homeostasis.