External Morphology Flashcards
What does a spiracle on sharks do?
Modified gill slits that open into the pharynx. Takes in water and ventilates the gills
What function does pelvic fins in sharks do?
They have claspers that assist in reproduction
What does a lateral line in shark function as?
Extensive network of pores that contain highly sensitive sensory allowign to detect currents, pressure changes, and prey nearby
Dorsal fin function?
Increase the lateral surface of the body during swimming
What is ampullae lorenzi?
Special sensing organs. The ycan form a network of mucus filled pores
Pectoal fins
Steering & braking while swimming & maintenance of dorsal-ventral orientation
Anal fin
Steering while swimming
Caudal fin
Provides thrust and acts as a rudder while swimming
Adbmoninal pores
Paired openings near cloaca
Liver
Produces bile and detoxifies constituents of the absorbed digested compounds
Gallbladder
Stores bile produced by the liver
Esophagus
Transports food to the stomach
Stomach
Site of food storage and initiation of digestion
Duodeneum
Recieves secretions from the liver & pancreas for further breakdown of food from. Stomach
Ileum
Primary site of digestion where most of the absorption of nutrients into the blood stream occurs
Cloaca
Common chamber for the release of urine, feces, and semen
Gills
High vascular structures for gas exchange with the bloodstream
Spleen
Elongate organ that stores blood and recycles worn out RBC’s
Heart
2-chambered organ that pumps deoxygenated blood to gills for oxygenation & form there throughout the various organ systems of the body
Sinus venosus
Thin-walled sac where deoxygenated blood from the body collects before being passed into tha atrium of the heart
Kindeys
Paired excretory organs that filter nitrogenous wastes from blood
What is the genus name of a shark
Squalus
