Human Heart and Circulatory System

The video explains how the heart and circulatory system work, focusing on how exercise affects heart rate and oxygen supply. It covers the anatomy of the heart, including its chambers and valves, and describes the roles of arteries and veins in blood circulation. The video also highlights the importance of oxygen as fuel for the body during physical activity.

Why does Jimmy want to become a hero in his school?

• By helping his friends

• By scoring high in exams

• By organizing an event

• By winning a race

What happens to the heart rate when you exercise?

• It slows down

• It stops

• It remains the same

• It doubles

What does the body need more of during exercise?

• Food

• Oxygen

• Water

• Rest

How does the heart supply oxygen to the body?

• By mixing oxygen with blood

• By storing it in muscles

• Directly from the air

• Through the skin

What is the role of the lungs in the circulatory system?

• To pump blood

• To store blood

• To clean and oxygenate blood

• To produce blood

What are the red and blue lines in the human body?

• Arteries and veins

• Cells and organs

• Nerves and muscles

• Bones and tissues

What is the approximate weight of a human heart?

• 500 grams

• 300 grams

• 100 grams

• 700 grams

How many chambers does the human heart have?

• Two

• Three

• Four

• Five

What happens when the heart valves open and close?

• The heart stops

• The heart beats

• The heart shrinks

• The heart expands

Which side of the heart receives oxygen-rich blood from the lungs?

• Left side

• Bottom side

• Top side

• Right side