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7th grade · Science · Unit 10 of 18

Human Body Systems

Breathing, blood, digestion and how the body responds

What your child practices

The main jobs of the respiratory, circulatory, digestive, excretory and nervous systems, how they work together, and what affects healthy function, such as exercise and air quality.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 7.13(A) · the main functions of human body systems

How we explain it

Children can open this short lesson before they practice.

  1. Respiratory: lungs take in oxygen. Circulatory: heart and blood carry it. Digestive: breaks down food.
  2. Excretory: kidneys clean the blood. Nervous: brain and nerves send messages.
  3. Systems work together. Exercise and clean air keep them healthy.

Example: Where is most food digested and its nutrients absorbed? The stomach starts breaking food down. Most absorption happens in the next part. Answer: the small intestine

Human Body Systems in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 10 of 18 in 7th grade Science, after Food Chains & Energy and before Heart, Bones & Muscles.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Texas Education Agency (TEA)

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Where does most digestion of food happen and nutrients get absorbed?

    • the kidneys
    • the small intestine
    • the lungs
    • the heart

  2. Question 2

    Why does your heart beat faster when you exercise?

    • Your heart is trying to cool the air.
    • Your muscles need more oxygen and nutrients delivered faster.
    • Your lungs need to rest.
    • Your blood needs to stop.

  3. Question 3

    Put the path of food through the digestive system in order.

    • 👄Mouth
    • ⬇️Esophagus
    • 🍽️Stomach
    • 🌀Small intestine

  4. Question 4

    Which body system does each organ belong to?

    Sort into: 🫁 Respiratory · 🍽️ Digestive

    • 🌬️trachea (windpipe)
    • 💧large intestine
    • 🫁lungs
    • 🌀small intestine
    • ⬇️esophagus
    • 🍽️stomach
    • ↕️diaphragm
    • 🫧alveoli

  5. Question 5

    A hand touches a hot pot and pulls away before the person feels pain. What is this quick response called?

    • circulation
    • digestion
    • a reflex
    • excretion

  6. Question 6

    Where in the lungs does oxygen pass into the blood?

    • the trachea
    • the stomach
    • the alveoli
    • the esophagus

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