adaptations for gas exchange

Question 1

what makes an insect?

Answer 1

3 pairs of legs, sometimes have wings, exoskeleton made of chitin

Question 2

what are the features of having an exoskeleton made of chitin?

Answer 2

impermeable- no gas exchange
waterproof- reduces water loss

Question 3

describe the process of ventilation in insects

Answer 3

pumping the abdomen draws air in and out of the tracheae via the spiracles. air moves into the tracheoles and arrives directly at muscle tissue

Question 4

describe one feature of the tracheae in insects

Answer 4

covered in chitin

Question 5

what is the significance of the tracheoles in insects?

Answer 5

site of gas exchange with muscles

Question 6

describe the spiracles

Answer 6

holes with valves
when closed-no gas exchange but less water loss
when open-gas exchange occurs but so does water loss

Question 7

which three substances must move into the cell (required for survival)?

Answer 7

oxygen (simple diffusion)
water (osmosis)
glucose (facilitated diffusion)

Question 8

which three substances move out of the cell?

Answer 8

carbon dioxide (simple diffusion)
water (osmosis)
urea (facilitated diffusion)

Question 9

what is the gas exchange surface of an amoeba?

Answer 9

cell membrane

Question 10

how does an amoeba/flatworm maintain its concentration gradient?

Answer 10

oxygen is always used in respiration, meaning the inside of the cells are always at a low concentration

Question 11

what is the gas exchange surface of a flatworm?

Answer 11

outer layer (NOT skin)

Question 12

how are amoebas adapted for gas exchange?

Answer 12

unicellular- decreased diffusion distance and increased SA:V

Question 13

how are flatworms adapted for gas exchange?

Answer 13

flattened body shape- decreased diffusion distance and increased SA:V