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?

   • Trachea
   • Alveoli
   • Capillaries
   • 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?

   • Lungs
   • Ribs
   • Bronchi
   • Diaphragm

4. 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.

5. 3.

   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?

   • Sensory nerve
   • Brain
   • Spinal cord
   • Receptor

6. Use this

   Nervous-system drawing, not to scale: a body outline with the signal path inside. Part | letter | job: brain | V | makes sense of signals, decides what to do and stores memories; ? | W | a nerve that carries the signal out to a muscle in the arm; muscle | X | contracts to move a body part when the signal arrives.

7. 4.

   Luz smells bread, then reaches for a slice. The job column says part W is a nerve that carries the signal out to a muscle in the arm. What is part W called?

   • Sensory nerve
   • Motor nerve
   • Spinal cord
   • Receptor
8. 5.

   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?

   • Diaphragm
   • Stomach
   • Bronchi
   • Throat

9. 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.

10. 6.

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

    • Muscle
    • Motor nerve
    • Sensory nerve
    • Brain
11. 7.

    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?

    • Muscle
    • Receptor
    • Spinal cord
    • Brain
12. 8.

    “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?

    • Cell
    • Organ system
    • Tissue
    • Organ

13. Use this

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

14. 9.

    Tala studies the brain. The job column says level Y is several tissues working together as one body part. What is level Y called?

    • Organ
    • Cell
    • Organ system
    • Tissue

15. 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:

16. 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?

    • Tissue
    • Organ
    • Organ system
    • Cell