OXYGEN TRANSPORT SYSTEM The body's oxygen transport system takes oxygen to the working muscles. The circulatory and respiratory systems working together. The main workers are the heart, blood and lungs. The whole oxygen transport system works in a cycle.
The Respiratory System Oxygen enters the body through the AND The oxygen then travel to the lungs where the O2 enters the blood. The oxygen then travel in the arteries to the which pumps the oxygen to the working muscles
The Respiratory System As you exercise a waste product is produced known as: CARBON DIOXIDE This is returned to your lungs by your blood. When you breath out the carbon dioxide leaves your body.
The Circulatory System The heart is a muscle. By contracting and relaxing the heart muscles can pump blood around the body. Arteries carry blood away from the body to vital organs and limbs (oxygenated blood) Veins return blood to the heart (deoxygenated blood)
The Circulatory System De-oxygenated blood from the body enters the heart from the vena cava here Oxygenated blood from the lungs enters the heart from pulmonary vein here
Oxygen debt During vigorous exercise the body needs a lot more energy. It gets this by… breathing in deeper and faster and rushing the oxygen to the muscles. This extra oxygen is then used to release more energy, needed to meet the higher level of demand. Soon a point is reached when the body cannot breathe any faster or harder, and aerobic respiration alone cannot meet the enhanced energy demands.
Oxygen debt So how do muscle cells get the extra energy they need? They get it by working anaerobically. Anaerobic respiration produces lactic acid (waste product), which accumulates in the muscles and causes muscle fatigue and cramps. Running the 1500 metres will build up an oxygen debt
Oxygen debt This extra oxygen needed to neutralise the harmful effects of anaerobic respiration is called an oxygen debt. In order to get the extra oxygen to 'pay back' the debt, the body continues to breathe deeply for some time after vigorous activity has ceased. When all the lactic acid in the muscles is broken down the oxygen debt has been repaid and normal aerobic respiration resumes.
Benefits of Improving Oxygen Transport System • Regular exercise is very good for the heart and lungs: it increases the size of the heart. • The lower your heart rate the fitter you are and it will take longer to reach to maximum heart rate. • After exercise the fitter you are the faster your pulse will return to normal. You can measure your heart rate by checking your pulse in your neck or wrist. A normal resting heartbeat is around 50 to 80 beats per minute.