The human gas exchange system is a group of organs that work together to enable us to breathe.

The molecules of a gas in a container collide with the walls of the container and this creates pressure.

The volume of a gas is the amount of 3D space it fills.

The human gas exchange system and breathing

Science

Breathing, respiration and gas exchange

Estimating lung volume

Adaptations of the human lungs for gas exchange

Cellular respiration

Aerobic cellular respiration

Anaerobic cellular respiration in humans

Anaerobic cellular respiration and fermentation in microorganisms

Pupils will learn how producers make glucose using photosynthesis, which is used to make biomass and as a fuel for cellular respiration.

Pupils learned how food is broken down to release useful substances such as sugar.

This unit explores the human gas exchange system, breathing mechanisms, and adaptations for function. It covers aerobic and anaerobic respiration, including fermentation, and compares their processes and implications. Focus is on accuracy, reliable measurements, and SI units.

Breathing and respiration

Physical activity and equipment requiring safe use

What is the name of the organ system in the body that enables breathing to occur? 

Put the following parts of the gas exchange system in order, to show the path that air takes when it enters the body.

Which part of the gas exchange system contracts and relaxes to change the volume of the lungs?

Breathing_System

When there is a {{}} pressure in the lungs, air will move into the lungs. 

What does the glass bell jar in this model of breathing represent?

The diaphragm also relaxes and curves up.

This increases the pressure in the lungs. 

Starting with the intercostal muscles, sort these statements into the correct order to describe the process of exhalation.

Which of the following organs is involved in breathing in the human body?

A group of similar cells working together.

Put these in order of complexity, starting with the simplest.

In which living process is oxygen used to release energy?

{{}} provide support for the human body and hold the body upright.

Skeletal {{}} in the human body contracts and relaxes to move the skeleton.

Starter Quiz