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

1. The _______ absorbs nutrients into the blood.
2. The _______ system uses the heart to pump blood — carrying oxygen and nutrients to every cell.
3. When different tissues work together, they form an _______ — like your heart or stomach.
4. And all your _______ together make you.
5. The respiratory system brings _______ in and pushes carbon dioxide out.

Choose the best option for each question.

1. What is the correct order from smallest to largest?
   a) Organ → Tissue → Cell → Systemb) Cell → Tissue → Organ → Systemc) System → Organ → Cell → Tissued) Tissue → Cell → System → Organ
2. Where does nutrient absorption mainly happen?
   a) Stomachb) Mouthc) Small intestined) Large intestine
3. Which system pumps blood around the body?
   a) Digestiveb) Respiratoryc) Skeletald) Circulatory

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

1. Cell → Tissue → Organ → System is one of the key concepts in the lesson on Organ Systems of the Body.
2. Organ → Tissue → Cell → System is the main topic of this lesson.
3. The small intestine absorbs nutrients into the blood.
4. The Stomach absorbs nutrients into the blood.

1. In your own words, explain what Organ Systems of the Body means.
2. List two things you learned from this lesson on Organ Systems of the Body.