General

General

General nature or nature terms.

Industry: Natural environment

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General

nektonic organisms

Biology; General

"Swimmers"; one of the two main types of organisms in the pelagic zone of the marine biome.

nephridium

Biology; General

The excretory organ in flatworms and other invertebrates; a blind-ended tubule that expels waste through an excretory pore.

nephron

Biology; General

A tubular structure that is the filtering unit of the kidney; consists of a glomerulus and renal tubule.

nerve net

Biology; General

An interconnected mesh of neurons that sends signals in all directions; found in radially symmetrical marine invertebrates, such as jellyfish and sea anemones, that have no head region or brain.

nerves

Biology; General

Bundles of neuronal processes enclosed in connective tissue that carry signals to and from the central nervous system.

Chemicals released from the tip of an axon into the synaptic cleft when a nerve impulse arrives; may stimulate or inhibit the next neuron. The chemical that crosses the synaptic cleft and causes the ...

nervous system

Biology; General

One of eleven major body organ systems in animals; coordinates and controls actions of internal organs and body systems, receives and processes sensory information from the external environment, and ...