Mrs Gren stand for:
Glucose+ Oxygen= Water+ Carbon Dioxide and Energy
Limewater is the indicator for the presence of Carbon Dioxide
Colbat Chloride is used to test for water vapour
Gas needed to keep candles burning is oxygen
Exhaled air contains water vapour.
Exhaled air has more carbon dioxide
Body needs food for energy
Glucose travels from digestive system to cells by blood
Lungs have a spongy texture inside
They can be expanded or compressed by the thorax
The trachea divides into 2 bronchi
The bronchi divide into bronchioles
Rings of cartilage keep trachea and bronchi open
The lining of the air passages is covered in cilia
Alveoli have a wall 1 cell thick and they transport the deoxygenated blood to the right pulmonary atery
Breathing and blood
When you breathe your intercostal muscles contract and life the rib cage up and out and the diaphragm contracts and flattens.
This means there is more volume and so air rushed in to fill the space which decreases the pressure and fills your lungs with air
Exhaling air is the opposite of this.
William Harvey discovered that the heart pumped blood around the body.
Lungs-picks up oxygen-pulmonary vein-l.atrium-l. ventricle-aorta-body-capillaries and oxygen is dropped and carbon dioxide is picked up-superior vena cava-inferior vena cava-r atrium-r ventricle- pulmonary artery
arteris carry blood away from heart
veins carry blood towards heart
capillaries carry blood between artersi and veins