Isk

Question 1

What happens when u breathe in?

Answer 1

Intercostal m + diaphragm contract, pull down
_
ribs move up+out
_
Volume of thorax increases
_
Pressure decreases x
_
Lung pressure< outside body
_
air drawn into lungies

Question 2

What are the main muscles involved in breathing?

Answer 2

Diaphragm+ intercostal

Question 3

What is the sit of gas exchange in fishes 🎣🐟🐟🐠🐠Oo it stank
Yer breath is mingin

Answer 3

Gills
👍🏻

Question 4

How does gas exchange occur in fish

Answer 4

Water flows in mouth , passes over the gills, under operculum

Question 5

How r gills specialessdd

Answer 5

Lots of filaments , network of capillaries 👋

Question 6

Y is gas exchange efficient in fish

Answer 6

Large sa of gills
Large sa network of capillaries in every filament
Short diffusion distance (filament+capilary 1 cell thick)
efficient ventilation of gills with water = counter current flow of water+ blood=high concentration gradient contained