Archenteron
The central cavity of the gastrula, which ultimately becomes the intestinal or digestive
cavity.
Archegonium
In plants, the female gametangium, a moist chamber in which gametes develop.
Archenteron
The endoderm-lined cavity, formed during the gastrulation process, that develops into the
digestive tract of an animal.
Archezoa
Primitive eukaryotic group that includes diplomonads, such as Giardia; some systematists
assign kingdom status to archezoans.
Arteriole
A very small artery. See also artery.
Arteries
Arteries are blood vessels that carry blood away from the heart
Artery
A vessel that carries blood away from the heart to organs throughout the body.
Arteriosclerosis
A cardiovascular disease caused by the formation of hard plaques within the arteries.
Artificial selection
The selective breeding of domesticated plants and animals to encourage the occurrence of
desirable traits.
Ascus
A saclike spore capsule located at the tip of the ascocarp in dikaryotic hyphae; defining
feature of the Ascomycota division of fungi.
Asexual reproduction
A type of reproduction involving only one parent that produces genetically identical
offspring by budding or by the division of a single cell or the entire organism into two or
more parts.
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