General

General

General nature or nature terms.

Industry: Natural environment

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General

Atrioventricular (AV) node

Biology; General

Tissue in the right ventricle of the heart that receives the impulse from the atria and transmits it through the ventricles by way of the bundles of His and the Purkinje fibers.

Bryophytes

Biology; General

The nonvascular plants, characterised by life cycles dominated by the gametophyte phase. This group includes the mosses, liverworts, and hornworts, which lack lignified conducting tissues.

Buffers

Biology; General

Chemicals that maintain pH values within narrow limits by absorbing or releasing hydrogen ions.

Bulbourethral glands

Biology; General

Glands that secrete a mucus-like substance that is added to sperm and provides lubrication during intercourse.

Bark

Biology; General

The outer layer of the stems of woody plants; composed of an outer layer of dead cells (cork) and an inner layer of phloem.

Inactivated X-chromosome in mammalian females. Although inactivated, the Barr body is replicated prior to cell division and thus is passed on to all descendant cells of the embryonic cell that had ...

Barriers to gene flow

Biology; General

Factors, such as geographic, mechanical, and behavioural isolating mechanisms that restrict gene flow between populations, leading to populations with differing allele frequencies.