oxygen(O2)
aveoli sac
Oxygen we inhale oxygen and exhale carbon dioxide
we breathe out a gas called carbon dioxide
Oxygen is used to help people breathe in and out
== == We breath out Carbon Dioxide gas which has the symbol CO2 It contains one atom of Carbon and two of Oxygen
oxygen
the suit of astronaut
All cells need Oxygen.
oxygen helps us breathe, we need it to supply our blood cells
Carbon dioxide is the gas you breathe out the second most. Oxygen is the gas you breathe out the most.
Oxygen is the gas humans and animals need to breathe in.
"Respire" means to breathe in and out; inhale and exhale. It also covers the the metabolic process of respiration in individual cells which is gas exchange across these cells' membranes.