General

General

General nature or nature terms.

Industry: Natural environment

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General

perichondrium

Biology; General

A layer of connective tissue that forms around the cartilage during bone formation. Cells in the perichondrium lay down a peripheral layer that develops into compact bone.

pleura

Biology; General

A thin sheet of epithelium that covers the inside of the thoracic cavity and the outer surface of the lungs.

perennials

Biology; General

Plants that persist in the environment for more than one year (as in the case of annuals).

The fundamental unit in the hierarchy of time units; a part of geologic time during which a particular sequence of rocks designated as a system was deposited. Units of geological time that are the ...

pleural cavity

Biology; General

The space between the sheets of pleura (one covering the inside of the thoracic cavity, the other covering the outside of the lungs).

periosteum

Biology; General

A fibrous membrane that covers bones and serves as the site of attachment for skeletal muscles; contains nerves, blood vessels, and lymphatic vessels.

peripheral nervous system

Biology; General

The division of the nervous system that connects the central nervous system to other parts of the body. Components of the nervous system that transmit messages to the central nervous system.