The amount of three-dimensional space occupied by a substance; usually measured in cm³.

The maximum volume of air that can be breathed out after breathing in fully.

The closer a measurement is to the true value, the more accurate it is said to be.

The surface of a liquid, which may appear curved.

An approximate (rough) value of a quantity (obtained without taking accurate measurements).

Estimating lung volume

Science

Breathing, respiration and gas exchange

The human gas exchange system and breathing

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

all of the air moves out of our lungs so they are totally empty

most of the air moves out of the lungs but some stays behind

Jun: “It means how loud the liquid or gas is.”

Lucas: “It means the height of the liquid or gas.”

Aisha: “It means how much 3D space the liquid or gas takes up."

Who correctly explains what is meant by the **volume** of a liquid or gas?

The maximum volume of air you can breathe out after breathing in fully is called your vital ...

Which units do we use when writing down a measurement of the volume of a liquid or gas?

The closer a measurement is to the true value, the more {{}} it is said to be.

After Sam exhaled into the tube, the water level in the bottle dropped by 17 lines. Each gap between lines represents 200 $$cm^3$$. Jacob’s vital capacity is {{}} $$cm^3$$.

Humans can’t stay underwater for too long because we need to breathe in ...

When we breathe in, air moves into the ...

Which scientific word means "breathe in”?

When we breathe in, the volume of the lungs ...

The lungs are not a big hollow bag, they are divided into tiny air sacs called ...

Exit Quiz

What happens when we exhale?