50 terms

RAT Dissection

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Heart
pumps blood throughout the body; ladybug shape with half-moon shaped ventricles
Lips
helps hold food in the mouth; upper lip is cleft in the center
External Nares
passageway for nasal passages; helps collect scents; shaped like commas
Pinna
directs sound waves; long, flexible, exterior folds
Upper and Lower Lids
keep eyes moisturized; spreads eye secretions; two thin layers of skin with lashes to bat away dust particles
Vibrissae
long, sensory hairs; whiskers, long, thin hairs
Teats
external opening for a mammary gland (to feed young); nipple
Urethral Orifice
male- expels sperm or urine; female- expels urine; male- small slit at the end of the penis
Vaginal Orifice
releases babies from uterus, releases discharge; vagina
Anus
opening to the rectum; muscular opening
Penis
passage for sperm during reproduction as well as the tract for urine
Scrotum
contains the testes; double pouch, large sac of skin
Tail
allows balance when climbing; releases heat from the rats' body; few scatters of hair over a scaly tail
Horny Claws
used to cling onto things; similar to nails
Esophagus
brings food to the stomach; muscular tube that extends from the pharynx to the stomach and connects the oral cavity to the stomach
Stomach
storage site for ingested food; begins physical and chemical digestion; muscular sac in abdominal cavity
Rugae
increase the elasticity; traction, and surface areas of the organ; long ridges lining the stomach
Pylorus
prevents small intestine contents from reentering the stomach; regulates how much food can be digested at once; connects the stomach to the duodenum
Small Intestine
site of most chemical digestion and the absorption of nutrients; long, thin tube in abdominal cavity; many villi and microvilli
Colon
large intestine; extracts water and salts from undigested solids
Caecum
helps digest some cellulose still in the remaining food of the large intestine
Rectum
continuation of the descending colon through the pelvic region; stores feces
Liver
regulates blood chemistry; produces bile
Trachea
carries air between lungs and larynx
Rings of Cartilage
support trachea; bendable material
Bronchi
branches at the beginning of each lunch to allow air into lungs
Lung
purifies air by extracting oxygen; large, expandable
Testes
produce sperm and testosterone; held outside the body by scrotum; joined by a thin sheet of tissue
Epididymis
stores sperm
Vas Deferens
transports sperm to be ejaculated; connects epididymis to urethra
Urethra
transports urine during urination; connects urinary bladder to the urethra
Prostate Gland
produces nourishing liquids for sperm
Vesicular Glands
produce fluids to balance the acidity of the vagina to allow sperm to live
cowpers gland
produces a clear, viscous secretion known as pre-ejaculate; one of two small exocrine glands present in the reproductive system.
Ovaries
secrete both estrogen and progesterone; releases eggs every month ;oval shaped
Uterus
accept a fertilized egg; directing blood flow; The uterus is needed for uterine orgasm to occur.; One end, the cervix, the other is connected to one or both fallopian tubes; major female hormone-responsive reproductive sex organ
vagina
path for menstrual blood and tissue to leave the body; deliver the infant from the uterus
Placenta
connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.
Embryo
earliest stage of development; eight weeks after fertilization
umbilical cord
supplies the fetus with oxygenated, nutrient-rich blood from the placenta and the umbilical arteries return the deoxygenated, nutrient-depleted blood. In placenta; the connecting cord from the developing embryo or fetus to the placenta
kidneys
regulation of sugar, maintenance of acid-base balance, and regulation of blood pressure
Peritoneum
forms the lining of the abdominal cavity or the coelom; it covers most of the intra-abdominal organs
adrenal gland
responsible for releasing hormones in conjunction with stress ;sit on top of the kidneys
urinary bladder
collects urine excreted by the kidneys before disposal by urination
Right atriums
It receives deoxygenated blood from the superior and inferior vena cava and the coronary sinus, and pumps it into the right ventricle
Left atrium
It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle
Interventricular septum
stout wall separating the lower chambers (the ventricles) of the heart from one another.
right ventricles
It receives deoxygenated blood
left ventricles
It receives oxygenated blood
Aorta
distributes oxygenated blood to all parts of the body