receives veins from the upper surfaces of the stomach and empties into the portal vein
radial vein
Noun
superficial veins ascending the radial side of the forearm
renal vein
Noun
veins that accompany renal arteries
retromandibular vein
Noun
posterior branch of the facial vein
right ventricle
Noun
the chamber on the right side of the heart that receives venous blood from the right atrium and pumps it into the pulmonary trunk
right atrium
Noun
the right upper chamber of the heart that receives blood from the venae cavae and coronary sinus
recombinant human insulin
Noun
a form of insulin (trade name Humulin) made from recombinant DNA that is identical to human insulin
relaxin
Noun
hormone secreted by the corpus luteum during the last days of pregnancy
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
releasing hormone
Noun
a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
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
releasing factor
Noun
a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
retina
Noun
the innermost light-sensitive membrane covering the back wall of the eyeball
recessive allele
Noun
an allele that produces its characteristic phenotype only when its paired allele is identical
recessive gene
Noun
gene that produces its characteristic phenotype only when its allele is identical
regulatory gene
Noun
a gene that produces a repressor substance that inhibits an operator gene
regulator gene
Noun
a gene that produces a repressor substance that inhibits an operator gene
repressor gene
Noun
gene that prevents a nonallele from being transcribed
reticuloendothelial system
Noun
a widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
reflex arc
Noun
the neural path of a reflex
red blood cell
Noun
a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues
reticulocyte
Noun
an immature red blood cell containing a network of filaments or granules
ribosome
Noun
an organelle in the cytoplasm of a living cell
retinal cone
Noun
a visual receptor cell in the retina that is sensitive to bright light and to color
rod cell
Noun
a visual receptor cell that is sensitive to dim light
right hemisphere
Noun
the cerebral hemisphere to the right of the corpus callosum that controls the left half of the body
retinal rod
Noun
a visual receptor cell that is sensitive to dim light
right brain
Noun
the cerebral hemisphere to the right of the corpus callosum that controls the left half of the body
rhinencephalon
Noun
a center in the cerebral hemispheres that governs the sense of smell in lower animals
reproductive cell
Noun
a spermatozoon or an ovum
reproductive system
Noun
organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring
respiratory system
Noun
the system for taking in oxygen and giving off carbon dioxide
respiratory tract
Noun
the passages through which air enters and leaves the body
rhombencephalon
Noun
the posterior portion of the brain including cerebellum and brainstem
reticular formation
Noun
a complex neural network in the central core of the brainstem
reticular activating system
Noun
the network in the reticular formation that serves an alerting or arousal function
reproductive organ
Noun
any organ involved in sexual reproduction
renal cortex
Noun
the cortex of the kidney containing the glomeruli and the convoluted tubules
radial nerve
Noun
largest branch of the brachial plexus
rima pudendi
Noun
the fissure between the labia majora
rima vulvae
Noun
the fissure between the labia majora
rete testis
Noun
network of tubules carrying sperm from the seminiferous tubules to the vasa efferentia
respiratory organ
Noun
any organ involved in the process of respiration
rectum
Noun
the terminal section of the alimentary canal
rear end
Noun
the fleshy part of the human body that you sit on
rib cage
Noun
the bony enclosing wall of the chest
radiocarpal joint
Noun
a joint between the distal end of the radius and the proximal row of carpal bones
ring of color
Noun
small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite
rhomboid muscle
Noun
any of several muscles of the upper back that help move the shoulder blade
rhomboid minor muscle
Noun
rhomboid muscle that draws the scapula toward the vertebral column and slightly upward