External Morphology

Question 1

What does a spiracle on sharks do?

Answer 1

Modified gill slits that open into the pharynx. Takes in water and ventilates the gills

Question 2

What function does pelvic fins in sharks do?

Answer 2

They have claspers that assist in reproduction

Question 3

What does a lateral line in shark function as?

Answer 3

Extensive network of pores that contain highly sensitive sensory allowign to detect currents, pressure changes, and prey nearby

Question 4

Dorsal fin function?

Answer 4

Increase the lateral surface of the body during swimming

Question 5

What is ampullae lorenzi?

Answer 5

Special sensing organs. The ycan form a network of mucus filled pores

Question 6

Pectoal fins

Answer 6

Steering & braking while swimming & maintenance of dorsal-ventral orientation

Question 7

Anal fin

Answer 7

Steering while swimming

Question 8

Caudal fin

Answer 8

Provides thrust and acts as a rudder while swimming

Question 9

Adbmoninal pores

Answer 9

Paired openings near cloaca

Question 10

Liver

Answer 10

Produces bile and detoxifies constituents of the absorbed digested compounds

Question 11

Gallbladder

Answer 11

Stores bile produced by the liver

Question 12

Esophagus

Answer 12

Transports food to the stomach

Question 13

Stomach

Answer 13

Site of food storage and initiation of digestion

Question 14

Duodeneum

Answer 14

Recieves secretions from the liver & pancreas for further breakdown of food from. Stomach

Question 15

Ileum

Answer 15

Primary site of digestion where most of the absorption of nutrients into the blood stream occurs

Question 16

Cloaca

Answer 16

Common chamber for the release of urine, feces, and semen

Question 17

Gills

Answer 17

High vascular structures for gas exchange with the bloodstream

Question 18

Spleen

Answer 18

Elongate organ that stores blood and recycles worn out RBC’s

Question 19

Heart

Answer 19

2-chambered organ that pumps deoxygenated blood to gills for oxygenation & form there throughout the various organ systems of the body

Question 20

Sinus venosus

Answer 20

Thin-walled sac where deoxygenated blood from the body collects before being passed into tha atrium of the heart

Question 21

Kindeys

Answer 21

Paired excretory organs that filter nitrogenous wastes from blood

Question 22

What is the genus name of a shark

Answer 22

Squalus