Blood and Oxygen Transport

Air is breathed in through the nose/mouth- then down trachea-Bronchi---Bronchioles---Alveoli-----Oxygen in CAPILLARIES by DIFFUSION.  

• Into the red blood cells- reacts with oxygen to make OXYHAEMOGLOBIN.
• Then into PULMONARY VEIN (into heart)
• Into heart--LEFT ATRIUM---LEFT VENTRICLE (has valves to prevent backflow)
• Aorta (main artery)
• Into SMALLER ARTERIES
• Then CAPILLARIES
• OXYGEN and HAEMOGLOBIN--Respiration=glucose+oxygen--CO2+water (In the mitochondria)
• Through the VEINS
• VENA CAVA

Into heart (RIGHT ATRIUM)

RIGHT VENTRICLE
PULMONARY ARTERY

Finally back into the CAPILLARIES- CYCLE STARTS AGAIN!