Cambridge Intl Science - Stage 3 - Unit 4 - Staying Alive

What is the main function of the brain?

• Pumping blood

• Thinking

• Digesting food

• Breathing

Answer explanation

The main function of the brain is thinking, which involves processing information, making decisions, and controlling body movements.

Which organ is responsible for pumping blood throughout the body?

• The heart

• The brain

• The lungs

• The stomach

Answer explanation

The heart is responsible for pumping blood throughout the body by contracting and relaxing to circulate blood to all the organs and tissues.

What is the main function of the heart?

• Thinking

• Breathing

• Pumping blood

• Digesting food

Answer explanation

The main function of the heart is to pump blood, which circulates oxygen and nutrients throughout the body.

Which organ is responsible for breathing?

• The lungs

• The stomach

• The brain

• The heart

Answer explanation

The lungs are responsible for breathing as they are the primary organs for gas exchange in the respiratory system.

What is the main function of the lungs?

• Pumping blood

• Breathing

• Thinking

• Digesting food

Answer explanation

The main function of the lungs is breathing, which involves the exchange of oxygen and carbon dioxide during respiration.

Which organ is responsible for digesting food?

• The brain

• The stomach

• The lungs

• The heart

Answer explanation

The stomach is responsible for digesting food by breaking it down with digestive enzymes and acids.

What is the main function of the stomach (and intestines)?

• Digesting food

• Breathing

• Pumping blood

• Thinking

Answer explanation

The main function of the stomach and intestines is to digest food, making the correct answer choice 'Digesting food'.

Which organ is responsible for thinking?

• The lungs

• The heart

• The stomach

• The brain

Answer explanation

The brain is responsible for thinking, making it the correct choice.

Which organ is responsible for pumping blood to the brain?

• The lungs

• The heart

• The brain

• The stomach

Answer explanation

The heart is responsible for pumping blood to the brain, making it the correct choice.

What is the main function of the stomach?

• Pumping blood

• Digesting food

• Thinking

• Breathing

Answer explanation

The main function of the stomach is to digest food, breaking it down into smaller particles for absorption by the body.