S: (n) tube foot (tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration)
S: (n) sucker (an organ specialized for sucking nourishment or for adhering to objects by suction)
S: (n) cupule (a sucker on the feet of certain flies)
S: (n) stinger (a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland)
S: (n) aculeus (a sharp-pointed process especially a sting of a hymenopterous insect)
S: (n) skeletal muscle, striated muscle (a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes)
S: (n) serratus posterior inferior (a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached)
S: (n) serratus posterior superior (a thin quadrilateral muscle of the upper and dorsal part of the thorax; acts to elevate the upper ribs)
S: (n) mid-calf (the middle of the calf; half way between the knee and ankle)
S: (n) gastrocnemius, gastrocnemius muscle (the muscle in the back part of the leg that forms the greater part of the calf; responsible for the plantar flexion of the foot)
S: (n) psoas (either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh)
S: (n) soleus, soleus muscle (a broad flat muscle in the calf of the leg under the gastrocnemius muscle)
S: (n) splenius, splenius muscle (either of two flat muscles that extend from the upper vertebrae to the base of the skull and serve to rotate or flex or extend the head and neck)
S: (n) peroneus (muscle of the lower leg that is involved in moving the foot)
S: (n) masseter (a large muscle that raises the lower jaw and is used in chewing)
S: (n) platysma (either of two broad muscles located on either side of the neck and innervated by the facial nerve; extends from lower jaw to clavicle and is involved in moving the mouth and jaw)
S: (n) smooth muscle, involuntary muscle (a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart))
S: (n) myometrium (the smooth muscle forming the wall of the uterus)
S: (n) physiological sphincter (a sphincter that is not recognizable at autopsy because its resting arrangement cannot be distinguished from adjacent tissue)
S: (n) cardiac sphincter (the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction)
S: (n) kidney (either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine) "urine passes out of the kidney through ureters to the bladder"
S: (n) liver (large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes)
S: (n) heart, pump, ticker (the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body) "he stood still, his heart thumping wildly"
S: (n) athlete's heart (enlarged heart commonly found among athletes trained for endurance)
S: (n) gill, branchia (respiratory organ of aquatic animals that breathe oxygen dissolved in water)
S: (n) ctenidium (comb-like respiratory structure serving as the gill of certain mollusks)
S: (n) ceras (one of the often brightly colored and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills)
S: (n) external gill (occurs in some mollusks and in tadpoles and other immature amphibians)
S: (n) lung (either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood)
S: (n) book lung (organ in many arachnids containing many thin folds of membrane resembling the leaves of a book)
S: (n) intestine, bowel, gut (the part of the alimentary canal between the stomach and the anus)
S: (n) small intestine (the longest part of the alimentary canal; where digestion is completed)
S: (n) duodenum (the part of the small intestine between the stomach and the jejunum)
S: (n) jejunum (the part of the small intestine between the duodenum and the ileum)
S: (n) ileum (the part of the small intestine between the jejunum and the cecum)
S: (n) large intestine (beginning with the cecum and ending with the rectum; includes the cecum and the colon and the rectum; extracts moisture from food residues which are later excreted as feces)
S: (n) colon (the part of the large intestine between the cecum and the rectum; it extracts moisture from food residues before they are excreted)
S: (n) megacolon (an abnormal enlargement of the colon; can be congenital (as in Hirschsprung's disease) or acquired (as when children refuse to defecate))
S: (n) transverse colon (the part of the large intestine that extends across the abdominal cavity and joins the ascending to the descending colon)
S: (n) ascending colon (the part of the large intestine that ascends from the cecum to the transverse colon)
S: (n) descending colon (the part of the large intestine that descends from the transverse colon to the sigmoid colon)
S: (n) carotid body (a chemoreceptor located near the bifurcations of the carotid arteries; monitors oxygen content of the blood and helps control respiration)
S: (n) nose, olfactory organ (the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals) "he has a cold in the nose"
S: (n) snout, neb (a long projecting or anterior elongation of an animal's head; especially the nose)
S: (n) naked eye (the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects) "it is not safe to look directly at the sun with the naked eye"
S: (n) peeper (an informal term referring to the eye)
S: (n) semicircular canal (one of three tube loops filled with fluid and in planes nearly at right angles with one another; concerned with equilibrium)
S: (n) stretch receptor (a receptor in a muscle that responds to stretching of the muscle tissue)
S: (n) tongue, lingua, glossa, clapper (a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity)
S: (n) glottis (the vocal apparatus of the larynx; the true vocal folds and the space between them where the voice tone is generated)
S: (n) larynx, voice box (a cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech)
S: (n) lens, crystalline lens, lens of the eye (biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina)
S: (n) gland, secretory organ, secretor, secreter (any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream)
S: (n) green gland (one of a pair of glands (believed to have excretory functions) in some crustaceans near the base of the large antennae)
S: (n) pancreas (a large elongated exocrine gland located behind the stomach; secretes pancreatic juice and insulin)
S: (n) Cowper's gland, bulbourethral gland (either of two glands that discharge a component of seminal fluid into the urethra; homologous to Bartholin's gland in the female)
S: (n) seminal vesicle (either of a pair of glands located on either side of the male urinary bladder that open into the vas deferens and that secrete many components of semen during ejaculation)
S: (n) digestive gland (any gland having ducts that pour secretions into the digestive tract)
S: (n) salivary gland (any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion)
S: (n) parotid gland (a large salivary gland that produces 50% of daytime saliva; in human beings it is located in front of and below each ear)
S: (n) sublingual gland, sublingual salivary gland (a small salivary gland that produces mucin (the viscous component of saliva); in human beings it is located on either side of the mouth under the tongue)
S: (n) prostate gland, prostate (a firm partly muscular chestnut sized gland in males at the neck of the urethra; produces a viscid secretion that is the fluid part of semen)
S: (n) thymus gland, thymus (a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age)
S: (n) corpus luteum (yellow endocrine tissue that forms in a ruptured Graafian follicle following the release of an ovum; it degenerates after a few days unless pregnancy has begun)
S: (n) sarcosome (a large mitochondrion in a striated muscle fiber)
S: (n) centriole (one of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis)
S: (n) ribosome (an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell) "the ribosome is the site of protein synthesis"
S: (n) end organ (a specialized structure at the peripheral end of some motor or sensory nerve fibers)
S: (n) organ (a government agency or instrument devoted to the performance of some specific function) "The Census Bureau is an organ of the Commerce Department"
S: (n) organ, pipe organ (wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard)