- Respiration is the process of releasing energy
- Aerobic respiration uses oxygen from the air to release energy from glucose
- Happens in every single cell
- A chemical reaction
- Glucose + oxygen à carbon dioxide + water + energy
Diffusion:
- Is the movement of particles from an area of high concentration to low concentration
Why heart and breathing rate change:
- A faster heart rate means more blood pumped around the body which takes oxygen and glucose to cells faster and removes carbon dioxide faster
- Faster breathing rate means that oxygen can be taken into the body faster and carbon dioxide released faster
- Cardiac output = stroke volume × heart rate
- Stroke volume is the volume of blood pumped in one beat.