Why does your heart beat?

The video tutorial explains how tires go flat when air escapes and how a pump can refill them. It draws an analogy between a pump and the human heart, describing how the heart pumps blood throughout the body. The tutorial also covers how the heart rate changes with activity levels, such as resting and exercising, and compares the function of a bicycle pump to the heart's role in circulating blood.

What happens to a tire when the air inside it escapes?

• It becomes heavier.

• It changes color.

• It inflates.

• It becomes flat.

How does a pump function in relation to a tire?

• It changes the tire's shape.

• It pushes air into the tire.

• It removes air from the tire.

• It cools down the tire.

What is the role of the heart in the human body?

• To digest food.

• To produce oxygen.

• To store energy.

• To pump blood around the body.

What happens to your heart rate when you are resting?

• It beats irregularly.

• It beats slowly.

• It beats faster.

• It stops.

Why does your heart beat faster during exercise?

• To reduce stress.

• To conserve energy.

• To cool down the body.

• To pump blood more quickly around the body.