Fill in each blank with the correct word from the lesson.

1. Every beat pumps blood around your body, delivering _______ and nutrients to every cell and removing waste.
2. Your _______ is about the size of your fist, but it is the hardest-working muscle in your body.
3. The right side receives oxygen-poor blood from the body and pumps it to the _______ to pick up fresh oxygen.
4. At the ends are tiny air sacs called alveoli — seven hundred million of them — where oxygen passes into the blood and _______, a waste gas, passes out.
5. Without this non-stop pumping, your _______s would die within minutes.

Choose the best option for each question.

1. How many times does your heart beat approximately each day?
   a) 1,000 timesb) 10,000 timesc) 100,000 timesd) 1,000,000 times
2. What gas do your lungs bring into your blood?
   a) Carbon dioxideb) Nitrogenc) Oxygend) Hydrogen
3. How many chambers does the heart have?
   a) 2b) 3c) 4d) 6

Write T for True or F for False in the brackets.

1. 100,000 times is one of the key concepts in the lesson on Heart and Lungs.
2. 1,000 times is the main topic of this lesson.
3. Every beat pumps blood around your body, delivering oxygen and nutrients to every cell and removing waste.
4. Every beat pumps blood around your body, delivering Carbon dioxide and nutrients to every cell and removing waste.

1. In your own words, explain what Heart and Lungs means.
2. List two things you learned from this lesson on Heart and Lungs.