The breathing and nervous systems, and how a signal reaches the brain

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   After a jog, Ari studies a breathing drawing. The job column says part Y is tiny air sacs where oxygen passes into tiny vessels. What is part Y called?

   • Capillaries
   • Trachea
   • Alveoli
   • Bronchi

2. Read this first

   Use this

   Breathing drawing, not to scale: a chest outline with the air path inside. where air enters the body; the windpipe, one tube that carries air down from the nose or mouth; tiny air sacs where oxygen passes into the tiny vessels around them; a muscle under the lungs that contracts to pull air in.

3. 2.

   Bo runs hard at recess. The job column says part Z is a muscle under the lungs that contracts to pull air in. What is part Z called?

   • Diaphragm
   • Bronchi
   • Ribs
   • Lungs

4. Use this

   where air enters the body; the windpipe, one tube that carries air down from the nose or mouth; organs that hold the branching tubes and the tiny air sacs; a muscle under the lungs that contracts to pull air in.

5. 3.

   Esme takes a deep breath on the field. The job column says part X is the windpipe, one tube that carries air down from the nose or mouth. What is part X called?

   • Bronchi
   • Trachea
   • Alveoli
   • Esophagus
6. 4.

   Nervous-system drawing, not to scale. Jun smells warm bread from the kitchen. The job column says part U, inside the nose, detects smells and starts a signal. What is part U called?

   • Receptor
   • Muscle
   • Spinal cord
   • Motor nerve

7. Use this

   Nervous-system drawing, not to scale: a body outline with the signal path inside. a nerve that carries the signal out to a muscle; contracts to move a body part when the signal arrives; a bundle of nerves in the back that can start a quick reflex.

8. 5.

   Kira grabs a backpack strap at the bell. The job column says part X is a bundle of nerves in the back that can start a quick reflex. What is part X?

   • Receptor
   • Brain
   • Sensory nerve
   • Spinal cord
9. 6.

   Breathing drawing, not to scale: a chest outline with the air path inside. Milo fills in the numbered air path: nose, trachea, a blank box, lungs, alveoli. Which part belongs in the blank box?

   • Bronchi
   • Diaphragm
   • Stomach
   • Throat

10. Use this

    Nervous-system drawing, not to scale: a body outline with the signal path inside. Parts shown: receptor, spinal cord. Numbered path: 1 receptor in the fingertip, 2 blank box, 3 spinal cord.

11. 7.

    Noah’s fingertip touches a smooth desk. A numbered path shows receptor, blank box, spinal cord. Which part belongs in the blank box?

    • Muscle
    • Brain
    • Sensory nerve
    • Motor nerve
12. 8.

    On a nature table, Pia brushes a prickly pinecone and pulls a hand back. In this reflex path, which part passes the signal from the sensory nerve to the motor nerve?

    • Spinal cord
    • Receptor
    • Brain
    • Muscle
13. 9.

    “Levels ladder, not to scale:” Ren studies how an arm is built. The job column says level X is a group of similar cells that do one job, like muscle cells working together. What is level X called?

    • Organ system
    • Tissue
    • Organ
    • Cell

14. Use this

    Levels ladder, not to scale: four steps from the smallest piece at the bottom to the biggest group at the top. Part | letter | job:

15. 10.

    Zee studies breathing. The job column says level Z is several organs working together on a big job, like the nose, windpipe and lungs. What is level Z called?

    • Organ
    • Organ system
    • Tissue
    • Cell