Circulatory & respiratory systems Flashcards
why do we have to breath?
cell respiration needs constant oxygen supply to give us energy and to keep blood circulation going
what happens to rib cage when you inhale?
it moves upwards and outwards
what happens to diaphragm when you inhale
contracts and flattens making it move downwards
what happened to chest when inhaling
chest volume increases and pressure decreases
what happens to lungs when you inhale
lungs become bigger and allows air to go inside
what happens to rib cage when you exhale
moves downwards and inwards
what happens to diaphragm when exhaling
relaxes becoming dome shaped
what happens to chest when exhaling
chest volume decrease and pressure increase
what happens to lungs when exhaling
lungs become smaller and forced air out lungs
where does gaseous exchange take place
takes place in lungs and cells of body
what is the alveoli
small structures made of air sacs
fill in the missing word: a big network of _ surrounds each alveolus
capillaries
what is the process called when gaseous exchange occurs
diffusion
what is diffusion
movement of participles from area of high concentration to low concentration
finish the sentence: heart pumps blood around your body by rhythmic, repeated contractions. this is felt as your _ _
heart beat
