air

alveolar

alveoli

alveolus

anatomical

anatomy

arteriole

artery

blood

body

bolt

breath

breathing

bronchi

capillaries

capillary

carbon

care

cell

design

diagram

diffuses

dioxide

drawing

erythrocytes

exchange

external

gas

graphic

health

healthy

human

lungs

medical

medicine

membrane

normal

organ

oxygen

parts

pore

pulmonary

red

respiration

respiratory

science

system

tissue

tract

vein

venule

vessels

wall

white