a chamber of the heart that receives blood from an atrium and pumps it to the arteries
holandric gene
Noun
a gene located on a Y chromosome
heterozygote
Noun
(genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring
homozygote
Noun
(genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic
hyaloplasm
Noun
the clear nongranular portion of the cytoplasm of a cell
hypothalamic releasing hormone
Noun
any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones
hypothalamic releasing factor
Noun
any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones
histamine
Noun
amine formed from histidine that stimulates gastric secretions and dilates blood vessels
homeotic gene
Noun
one the genes that are involved in embryologic development
homeobox
Noun
one of various similar homeotic genes that are involved in bodily segmentation during embryonic development
homeobox gene
Noun
one of various similar homeotic genes that are involved in bodily segmentation during embryonic development
hormone
Noun
the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
haplotype
Noun
(genetics) a combination of alleles (for different genes) that are located closely together on the same chromosome and that tend to be inherited together
helper T cell
Noun
T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells
helper cell
Noun
T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells
hemisphere
Noun
either half of the cerebrum
hemisphere
Noun
half of the terrestrial globe
hemisphere
Noun
half of a sphere
histiocyte
Noun
a macrophage that is found in connective tissue
hybridoma
Noun
a hybrid cell resulting from the fusion of a lymphocyte and a tumor cell
hypothalamus
Noun
a basal part of the diencephalon governing autonomic nervous system
hypoglossal
Noun
supplies intrinsic muscles of the tongue and other tongue muscles
hypoglossal nerve
Noun
supplies intrinsic muscles of the tongue and other tongue muscles
hindbrain
Noun
the posterior portion of the brain including cerebellum and brainstem
hypophysis
Noun
the master gland of the endocrine system
hypophyseal stalk
Noun
the funnel-shaped stalk connecting the pituitary gland to the hypothalamus
hypogastric plexus
Noun
a plexus of nerves serving the pelvic viscera
hippocampus
Noun
a complex neural structure (shaped like a sea horse) consisting of grey matter and located on the floor of each lateral ventricle
human head
Noun
the head of a human being
hymen
Noun
a fold of tissue that partly covers the entrance to the vagina of a virgin
hindgut
Noun
the caudal part of the alimentary canal in vertebrate embryos
hiatus
Noun
a natural opening or perforation through a bone or a membranous structure
hiatus
Noun
a missing piece (as a gap in a manuscript)
hiatus
Noun
an interruption in the intensity or amount of something
hair follicle
Noun
a small tubular cavity containing the root of a hair
hind end
Noun
the fleshy part of the human body that you sit on
human elbow
Noun
hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped
hamstring
Noun
one of the tendons at the back of the knee
hamstring
Verb
cripple by cutting the hamstring
hamstring
Verb
make ineffective or powerless
hamstring tendon
Noun
one of the tendons at the back of the knee
horny structure
Noun
any rigid body structure composed primarily of keratin
half-moon
Noun
the crescent-shaped area at the base of the human fingernail
half-moon
Noun
the time at which the Moon is at first or last quarter when half its face is illuminated
homograft
Noun
tissue or organ transplanted from a donor of the same species but different genetic makeup
heterograft
Noun
tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species
human foot
Noun
the part of the leg of a human being below the ankle joint
hangnail
Noun
a loose narrow strip of skin near the base of a fingernail
human knee
Noun
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella