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Advanced Body Systems Exploration

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Advanced Body Systems Exploration

Follow the journey of food and oxygen through the body. Use the scenarios and your science knowledge to explain how body systems work together. Write in complete sentences where needed.

Trace the journey

A team of body systems helps cells get what they need and remove waste.

1.After a meal, food is broken down into small nutrient molecules. Name the organ where most nutrients are absorbed into the blood, and explain what happens to those nutrients next.

2.Put these events in the correct order, from breathing in to a muscle cell using oxygen: oxygen moves into a muscle cell; air reaches the lungs; blood carries oxygen around the body; oxygen passes from the lungs into the blood.

3.During a fast uphill walk, Maia breathes more quickly. Explain why her working muscles need more oxygen and what happens to the waste gas they produce.

4.Choose the best explanation: Why do both the air sacs in the lungs and the lining of the small intestine have a large surface area?

A large surface area gives more space for substances to move across into or out of the body.
A large surface area makes the organs store more oxygen and food.
A large surface area stops blood from moving through the organs.

5.True or false? Digestion breaks food into nutrients, while the respiratory system brings oxygen into the body; the blood helps deliver both oxygen and absorbed nutrients to cells.

TrueFalse

Solve the body-system challenge

Apply what you know to situations the body might face.

6.Wiremu skips breakfast and then runs to catch the bus. He feels shaky and light-headed. Give two possible body-related reasons for how he feels. State one action that would be sensible if the feeling continues.

7.A person is very stressed before a meal. Explain one way stress can affect digestion, and describe how slow, calm breathing might help the body settle.

8.A runner's breathing rate returns to normal a few minutes after a race. Explain why breathing stays faster for a short time after the runner stops.

9.Complete the sentence: After food is digested into nutrients and the nutrients enter the blood, the blood carries them to .

10.Complete the sentence: During cellular respiration, cells produce ________, which is carried to the lungs to be breathed out.

11.Design a fair investigation to find out whether gentle walking or brisk walking causes a larger increase in breathing rate. State what you would change, what you would measure, and one thing you would keep the same.

12.A friend says, “The lungs digest food because oxygen helps cells release energy.” Explain what is incorrect in this statement and give a more accurate explanation of how the digestive and respiratory systems work together.