gas exchange Flashcards
what’s the countercurrent system and why is there one🌸
when blood and water flow in opposite directions
to maintain a steep concentration gradient
name some ways insects are adapted to gas exchange and how this helps💓
trachioles extend thru body- air is brought to tissue- short diffusion pathway
muscles contract- moves air in and out
spiracles open and close to let gas in&out
describe what happens during inspiration and expiration🩵
inspiration-diaphragm contracts and flattens, ribs up and out, lung volume increases (requires energy)
expiration-diaphragm relaxes and domes, ribs down and in, lung volume decreases
where does gas exchange occur in the lungs? 🫁
alveoli
what’s an adaptation of red blood cells for gas exchange💕
they can flatten against capillary walls to reduce the distance needed for diffusion
what maintains the concentration gradient in the lungs?🐬
the movement of air in and out of
