What is the difference between inhaled and exhaled air bitesize

It is:. In this experiment, the sodium hydroxide solution in the left-hand flask absorbs carbon dioxide, so the respiring organisms must have produced the carbon dioxide detected in the right-hand flask. The release of heat can be shown by carrying out an experiment using germinating seeds. Two vacuum flasks are used:. Investigating respiration Respiration by living organisms can be investigated by carrying out experiments to show the production of carbon dioxide and heat.

When exercising, cells will need more oxygen and produce more carbon dioxide as a result of increased respiration. When blood reaches the lungs, a larger volume of air is needed to replace the oxygen used and remove the carbon dioxide produced by this extra respiration. In order to supply more oxygen to the exercising cells, the body increases the rate and depth of breathing. The time taken for the breathing rate to return to normal is known as the recovery time.

This can be used as a measure of fitness. Breathing A lung model can be used to demonstrate the process of breathing. Capillaries surround the alveoli in the lungs. Both the capillaries and alveoli walls are very thin - just one cell thick. They are made of semi-permeable membranes which allow oxygen and carbon dioxide to pass through them. Describe the process of gas exchange at the muscles. In the muscle there is a high concentration of carbon dioxide and in the bloodstream there is a high concentration of oxygen.

Oxygen diffuses from the bloodstream into the muscles and carbon dioxide diffuses into the blood from the muscles. Respiratory system structure and function Passage of air into the lungs Air enters the body and is warmed as it travels through the mouth and nose. It then enters the trachea. The trachea divides into two bronchi.

One bronchus enters each lung. Each bronchus branches out into smaller tubes called bronchioles. Air travels through these bronchioles.

At the end of the bronchioles, the air enters one of the many millions of alveoli where gaseous exchange takes place.