Squid

Question 1

Types of molluscs

Answer 1

bivalves

gastropods

cephalopod

Question 2

What does cephalopod mean?

Answer 2

caphalo- head

pod- foot

Question 3

How do octopi and squid differ

Answer 3

squids have eight arms and two longer tentacles with suction cups only at then end

Question 4

What does the mantle possess?

Answer 4

chromatophores

Question 5

How does chromatophores change color?

Answer 5

by expanding and constricting themselves rapidly

Question 6

How do squids communicate

Answer 6

visually, unlike human verbal communication

Question 7

Fast vs slow swimming

Answer 7

fast- siphon

slow- fins

Question 8

How do squids swim fast

Answer 8

fills mantle with water

constricts muscles and shoots water out of sipohn

Question 9

What is the collar?

Answer 9

flap of the mantle

Question 9

How do male and female squids differ?

Answer 9

white gonad in the middle with a clear top (ovaries)- female

white gonad at the top- male

Question 10

what is the nidamental glands

Answer 10

white portion of the female that makes a gelatinous casing that holds the eggs

Question 11

How does ink distract predators (@)

Answer 11

visiual

olfactory- cannot smell

Question 12

what is the branchial heart?

Answer 12

heart connected to each gill, aka gill heart

Question 13

How does squid blood differ

Answer 13

copper based- clear when oxygenated, blue when de-oxygenated

Question 14

What color is iron based blood

Answer 14

bright red- oxygenated

dark red- deoxygenated

Question 15

Why is the eye so large?

Answer 15

to see in low light and illuminate blind spots

Question 16

What is found in the eye

Answer 16

fluid and lenses

Question 16

what is the lens for?

Answer 16

to focus on objects

Question 16

What is the gladius?

Answer 16

reduced, internal shell

Question 17

Function of fin

Answer 17

helps in swimming, to stabilize and help propel the squid

Question 18

function of mantle

Answer 18

The main part of the squid containing and protecting the organs, pen, and chromatophores. With the help of chromatophores, it can change color to camouflage, mate, and communicate

Question 19

function of siphon

Answer 19

helps propel the squid through water by taking in water and pushing it out of the siphon- similar to a jet propulsion.

Question 20

function of arm

Answer 20

Eight of the ten appendages on the squid are the arms. The arms are not equal in length, but are all shorter than the tentacles. The main function is to capture and manipulate prey. It is also involved in behavioral displays, locomotion, and reproduction. It possesses hooks that can capture the prey, and suckers to hold onto prey.

Question 21

function of tentacles

Answer 21

The remaining two appendages are around equal in length and much longer than the arms. Used to grasp prey using hooks and suckers and brings it in reach to the arms. The hooks in the tentacles can rotate, unlike the static hooks in the arm.

Question 22

Function fo chromatophores

Answer 22

Specialized cells in the skin containing pigment that changes the squid’s color quickly. It can be used to camouflage, but can be used to mate.

Question 23

function of pen

Answer 23

an internalized, reduced shell that acts as a site for muscles to attach to, and protects the visceral organ by forming a barrier. Its durability and flexibility are reinforced by chitin and proteins.

Question 24

function of caecum

Answer 24

Connects to the stomach, and is part of the digestive tract. After the stomach begins digestion, the caecum continues digestion and is the primary site of nutrient absorption.

Question 25

function of kidneys

Answer 25

Where waste is transferred from the blood.

Question 26

function of gills

Answer 26

used for respiration. As water passes through the mantle opening, it passes through the gills and oxygen diffuses into the blood, which is then transported to the gill heart.

Question 27

function of ink sac

Answer 27

Contains ink which is expelled when threatened using the siphon. This creates a dark cloud that obscures the predator’s vision to allow escape. It also functions in the excretion of melanin.

Question 28

function of brain

Answer 28

located in the head, acts as a control center and transmits information to nerve cells in the mantle.

Question 29

function of funnel retractor muscle

Answer 29

Inserts on the dorsal portion of the funnel and helps support and position the funnel during jet locomotion.

Question 30

function of gill heart

Answer 30

blood to the gill, where oxygen is taken up, flowing to the systemic heart.

Question 31

function of systemic heart

Answer 31

After receiving oxygenated blood from the gill heart, the systemic heart pumps oxygen to the rest of the squid’s body.

Question 32

function of optic lobe

Answer 32

The part of the squid’s brain that processes visual information received from the eyes.