Revision Unit 1 - 9 Grade 7

What is the correct order for the moving of air from the outside of the body to the place where gas exchange happens?

• bronchiole --> trachea --> bronchus - alveoli

• trachea --> bronchus --> bronchiole --> alveoli

• alveoli --> trachea --> bronchus --> bronchiole

• alveoli --> bronchus --> bronchiole --> trachea

These are also called air sacs

• alveoli

• bronchus

• bronchioles

• lungs

Which statement is correct?

• every living cell respires

• only animal cells respire

• respiration uses up energy

Which statement is correct?

• Expired air contains only carbon dioxide

• Expired air contains more carbon dioxide than inspired air

• Expired air contains more oxygen than inspired air

Which statement is correct?

• Respiration means using your diaphragm to move air into the lungs

• Respiration is the diffusion of gases between the air sacs and the blood

• Respiration is a series of chemical reactions that releases useful energy from glucose

Red blood cells are specialized because they DO NOT have

• nucleus

• cell membrane

• cytoplasm

A __________ is a solid that dissolved in a liquid

• solute

• solvent

• solution

• mixture

The liquid that substances dissolved into is called ____________

• solvent

• mixture

• solution

• insoluble

Combination of solute and solvent is called

• saturated

• volume

• mixture

• solution

A solid that does not dissolve in a liquid is called

• insoluble

• soluble

• saturated

• mixture