Shark anatomy

Question 1

External nares (nostrils)

Answer 1

smell and helps detect chemicals

Question 2

Spiracles

Answer 2

allows water to pass through gills

Question 3

Mouth

Answer 3

water intake through gills & eating

Question 4

Gill Slits

Answer 4

allows water to exit

Question 5

Lateral Line

Answer 5

detects vibrations in water

Question 6

Cloaca

Answer 6

releases waste and sperm, also opening for sex organs

Question 7

Claspers

Answer 7

aid in sperm transfer during mating

Question 8

Fins

Answer 8

Caudal Fin = propulsion
Dorsal Fin = stability
Pectoral Fin = steering
Pelvic Fin = stabilize and allow up & down movements

Question 9

Dorsal Spines

Answer 9

has poison gland for defense

Question 10

Ampullae of Lorenzini

Answer 10

(electroreceptor) detects electronic field changes

Question 11

Scales

Answer 11

Denticles (made up of placoid scales) for protection & reduce turbulence so sharks swim quicker

Question 12

Myomeres

Answer 12

muscles that allow lateral movements

Question 13

Myosepta

Answer 13

connective tissues that connects myomeres together

Question 14

Esophagus

Answer 14

connects pharynx to stomach

Question 15

Stomach

Answer 15

aids in digestion

Question 16

Duodenum

Answer 16

(1st part of intestine) receives bile from bile duct, mixing bowl of digestive juices)

Question 17

Gall Bladder

Answer 17

stores bile secreted by the liver

Question 18

Bile Duct

Answer 18

carries bile to the duodenum

Question 19

Liver

Answer 19

produces squalene (increase buoyancy) & bile (breaks down fat)

Question 20

Pancreas

Answer 20

secretes digestive enzymes into the stomach

Question 21

Spiral Valve (intestine)

Answer 21

(2nd part of intestine) has spiral valve; increases surface area which makes the intestine more efficient in food absorption

Question 22

Rectum

Answer 22

(2nd part of intestine) stores solid wastes

Question 23

Rectal Glands

Answer 23

regulate salt concentration

Question 24

Heart

Answer 24

ventral heart, has atrium and ventricle

Question 25

Atrium

Answer 25

receives blood

Question 26

Ventricle

Answer 26

pumps blood

Question 27

Conus Arteriosus

Answer 27

gives blood flow an added boost

Question 28

Spleen

Answer 28

stores & repairs red blood cells

Question 29

Gills

Answer 29

allows fish to take in oxygen from water & get rid of carbon dioxide

Question 30

Kidneys

Answer 30

extracts urea from urine & returns the urea to the blood

Question 31

Testis

Answer 31

produce sperm

Question 32

Ovaries

Answer 32

generate germ cells, secrete hormones, collect accumulate yolks/eggs

Question 33

Uterus

Answer 33

where eggs develop into embryos

Question 34

Yolk sac

Answer 34

provides embryo with nourishment

Question 35

Embryo

Answer 35

unborn shark egg that will develop into a shark

Question 36

3 parts of intestine

Answer 36

Duodenum, Spiral Valve, Rectum