Rat Dissection






The internal anatomy of the rat looked very similar to that of the frog.

The Digestive System

• Mouth
• Epiglottis- keeps the food from going down the trachea
• Esophagus
• Stomach- stores and physically breaks down food, digests protein
• Small Intestine- 3 regions = Duodenum, Jejunum, Ileum 
• Large Intestine (colon)- 3 regions = Ascending, Transverse, and Descending
• Caecum- pouch that separates the small and large intestine (similar to the appendix in humans)
• Rectum- stores feces until they are expelled from the anus

The Urogenital System

• Prepuce- foreskin
• Penis
• Prostate gland and seminal vesicles- secrete materials that form semen 
• Scrotum sac- contains the testes
• Testis- produce sperm and male hormones
• Vas Deferens- moves sperm from the epidymis to the urethra
• Epididymis- collects and stores sperm cells

• Kidneys- Regulate electrolytes and blood pressure, naturally filter blood, produce urine (excrete wastes such as urea and ammonium in the urine) and reabsorb water, glucose adn amino acids.
• Bladder- store and release urine.
• Ureters- connect the kidneys with the bladder



The lungs in the rat were smooth while
 the lungs in the frog were bumpy and the
gills in the fish were feathery

The Respiratory System

• Nose
• Glottis- leads to the trachea
• Trachea- the cells in the trachea
• Lungs- where gas exchange occurs



The skin and fur protect the animal and keep it from drying out

 The Integumentary System

• Skin 
• Fur

The Circulatory System

• Heart- brings oxygen-rich blood to living cells.
• Veins- bring blood towards the heart
• Arteries- bring blood away from the heart
• Pulmonary Circuit- transportates blood between the heart and the lungs

http://biology.kenyon.edu/courses/biol09/Rat/circulation/framecirc.htm
http://www.buzzle.com/articles/trachea-function.html
http://www.biologycorner.com/lesson-plans/anatomy/