Bio Lab Practical 2

1

Mouth

2

Siphon

Function of siphon?

Muscular tube for jet propulsion, respiration, waste expulsion, ink release

3

Vena cava

4

Liver

5

Intestine

6

Ink sac

Function of ink sac?

Produces and releases ink as a defensive mechanism

7

Pancreas

8

Gill

9

Branchial heart

10

Heart

Difference between brachial and systemic heart in squid?

Brachial pumps deoxygenated blood to the gills

Systemic heart pumps oxygenated blood to the body

11

Sinus Venosus

Function of sinus venosus

Collects deoxygenated blood from the body and delivers it into the systemic heart, acting as the heart’s low pressure receiving chamber.

12

Stomach

13

Anus

14

Mantle

15

Tentacle

16

Arm

Function of tentacle vs arms?

Arms - for holding, manipulating, controlling prey. Provides fine control so prey can be brought to the beak. Have suckers all along length.

Tentacles - for rapidly striking and capturing prey at a distance. Longer and have suckers only at tips.

1

Olfactory Tract

Function of olfactory tract?

Carries smell info from olfactory bulb to primary olfactory cortex, allowing the brain to interpret odors

2

Cerebrum

3

Cerebellum

Function of cerebrum vs cerebellum?

Cerebrum - higher thinking, voluntary actions, sensory processing

Cerebellum- controls balance, coordination, fine tune movements

4

Medulla Oblongata

Function of medulla oblongata?

Controls heart rate, breathing, blood pressure, coughing, sneezing, swallowing, vomiting.

5

Spinal cord

6

Gills

7

Heart

8

Liver

9

Stomach

10

Pyloric caeca

Function of the pyloric caeca?

Increase digestive SA and secrete digestive enzymes, allowing highly efficient nutrient absorption

11

Spleen

12

Duodenum

Function and location of the duodenum?

Beginning of the small intestine right after the stomach

Neutralizes stomach acid and begins nutrient absorption

13

Intestine

14

Anus

15

Gonad

16

Air bladder

17

Kidney

18

Ureter

19

Bladder

20

Dorsal aorta

21

Pelvic fin

22

Anal fin

23

Caudal fin

24

First dorsal fin

25

Second dorsal fin

Identify

Nasal

Identify

Maxillary

1

1st walking leg with gill (Cheliped)

2

2nd walking leg with gill

3

3rd walking leg with gill (female sex opening)

4

4th walking leg with gill

5

5th walking leg (male sex opening)