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
ring finger
Noun
the third finger (especially of the left hand)
rachis
Noun
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
rachis
Noun
axis of a compound leaf or compound inflorescence
raw talent
Noun
powerfully impressive talent
rudiment
Noun
the remains of a body part that was functional at an earlier stage of life
rudiment
Noun
the elementary stages of any subject; usually plural
rotator cuff
Noun
a supporting structure of the shoulder consisting of the muscles and tendons that attach the arm to the shoulder joint and enable the arm to move
respiratory center
Noun
the center in the medulla oblongata and pons that integrates sensory information about the level of oxygen and carbon dioxide in the blood and determines the signals to be sent to the respiratory muscles
road sense
Noun
good judgment in avoiding trouble or accidents on the road
ruga
Noun
(anatomy) a fold or wrinkle or crease
renal pelvis
Noun
a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter
rima
Noun
a narrow elongated opening or fissure between two symmetrical parts
rima glottidis
Noun
the space between the two true vocal folds
rotary joint
Noun
a freely moving joint in which movement is limited to rotation
rima vocalis
Noun
the space between the two true vocal folds
rotatory joint
Noun
a freely moving joint in which movement is limited to rotation
rima vestibuli
Noun
the opening between the false vocal folds
rima respiratoria
Noun
the opening between the false vocal folds
Roman nose
Noun
a nose with a prominent slightly aquiline bridge
rustiness
Noun
ineptitude or awkwardness as a consequence of age or lack of practice