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hair cell:
Specialized sensory epithelial cell in the ear with bundles of
giant microvilli (stereocilia) protruding from its apical surface.
Sound vibrations tilt the stereocilia, evoking an electrical change
in the hair cell, which thus acts as a sound detector.
haploid:
Having only one set of chromosomes, as in a sperm cell or a bacterium,
as distinct from diploid (having two sets of chromosomes).
heat shock protein (stress-response protein):
Protein synthesized in response to an elevated temperature or
other stressful treatment; usually helps the cell to survive the
stress.
HeLa cell:
Line of human epithelial cells that grows vigorously in culture.
Derived from a human cervical carcinoma.
a
helix:
see alpha helix
heme:
Cyclic organic molecule containing an iron atom that carries oxygen
in hemoglobin and carries an electron in cytochromes.
hemidesmosome:
Specialized cell junction between an epithelial cell and the underlying
basal lamina.
hemoglobin:
The major protein in red blood cells that associates with O2
in the lungs by means of a bound heme group.
hemopoiesis (hematopoiesis):
Generation of blood cells, mainly in the bone marrow.
heterocaryon:
Cell with two or more nuclei produced by the fusion of two or
more different cells.
heterochromatin:
Region of a chromosome that remains unusually condensed and transcriptionally
inactive during interphase.
heterodimer:
Protein complex composed of two different polypeptide chains.
heterozygote:
Diploid cell or individual having two different alleles of a specified
gene.
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