From cells to organ systems

Grade 9 Science Worksheet

Circle the best answer.

1. Read this first

   Card (textbook facts)

   structure	tissue it holds
   skin	stratified squamous epithelium on the outside
   skin	fibrous connective tissue in the dermis

2. 1.

   Luz sorts a body part using the card. The card lists what the skin holds. Which level is the skin?

   • Organ system
   • Cell
   • Organ
   • Tissue
3. 2.

   Pia reads the muscle card. A sample shows stripes, one nucleus in the center of each cell, and no voluntary control. Which tissue is it?

   • Cardiac muscle
   • Smooth muscle
   • Nervous tissue
   • Skeletal muscle
4. 3.

   Ren reads the muscle card. A sample from the wall of the intestine has no stripes and one central nucleus per cell. Which tissue is it?

   • Skeletal muscle
   • Nervous tissue
   • Smooth muscle
   • Cardiac muscle
5. 4.

   Tala reads the muscle card. A sample has stripes, many nuclei along each cell's edge, and voluntary control. Which tissue is it?

   • Skeletal muscle
   • Smooth muscle
   • Nervous tissue
   • Cardiac muscle

6. Map (model, not to scale)

   Four boxes. The digestive system sends an arrow to the circulatory system, marked nutrients. The respiratory system sends an arrow to the circulatory system, marked oxygen. The circulatory system sends an arrow to the muscle cells, marked nutrients and oxygen. The muscle cells send an arrow back to the circulatory system, marked carbon dioxide.

7. 5.

   Zee studies a model map. In the model, the digestive system stops supplying the circulatory system. What does the circulatory system then have less of to deliver to muscle cells?

   • Nutrients to deliver to the muscle cells
   • Carbon dioxide to collect from the muscle cells
   • Nothing to deliver, since the two systems do not depend on each other
   • Oxygen to deliver to the muscle cells
8. 6.

   Ari studies a model map. In the model, the circulatory system stops collecting carbon dioxide from muscle cells. What does the respiratory system then have less of to release?

   • Carbon dioxide to release into the air
   • Nutrients to release into the air
   • Oxygen to release into the air
   • Nothing to release, since the lungs make their own carbon dioxide

9. Map (model, not to scale)

   Three boxes. The digestive system sends an arrow to the circulatory system, marked nutrients. The respiratory system sends an arrow to the circulatory system, marked oxygen.

10. 7.

    Bo studies a model map. Which system receives a supply from both the digestive system and the respiratory system?

    • The respiratory system
    • Neither, since each sends supplies straight to cells
    • The circulatory system
    • The digestive system

11. Use this

    Card (model data), 4 rows. Columns: structure, tissue types inside, cells (thousands). W, muscle only, 900. X, epithelial, connective and muscle, 400. Y, epithelial only, 700. Z, nervous only, 200.

12. 8.

    Esme reads a model card of four structures. An organ holds two or more tissue types. Which structure is an organ?

    • Structure Y
    • Structure W
    • Structure Z
    • Structure X

13. Card (model data)

    layer of structure K	tissue type
    inner lining	epithelial
    second layer	connective
    third layer	muscle
    fourth layer	muscle
    outer covering	epithelial

14. 9.

    Jun reads a model card of structure K. How many different tissue types does K hold?

    • Two
    • One
    • Three
    • Five

15. Use this

    Card (model data), 4 rows. Columns: structure, tissue types inside, cells (thousands). P, epithelial and connective, 150. Q, epithelial, connective, muscle and nervous, 90. R, muscle only, 300. S, epithelial and muscle, 450.

16. 10.

    Kira reads a model card of four structures. An organ holds two or more tissue types. Which structure is a single tissue, not an organ?

    • Structure Q
    • Structure R
    • Structure P
    • Structure S