به انگلیسی

Cells, Tissues, and Organs: How Your Body Is Built

Science · The Human Body · ages 7-9

Name ______________________ Date ____________

Most body cells are large enough to see clearly with your eyes alone.
Circle one: True False
What is the smallest living unit of your body?
- A cell
- An organ
- A tissue
Which list follows the body's building order?
- Cell, tissue, organ, organ system
- Organ, cell, tissue, organ system
- Tissue, organ, cell, organ system
Muscle tissue works with other tissues. What can these different tissues form together?
- One single new muscle cell
- An organ, such as the heart
- A new organ system with several organs
Many similar cells work together to do one job. What is this group called?
- A tissue
- An organ
- A system
How does a microscope help you study a tiny body cell?
- It turns one cell into a whole tissue.
- It makes the cell grow into an organ.
- It makes a small cell look larger.
Leo calls the heart and blood vessels together one organ because they move blood. Which description fits this team?
- A single tissue: similar cells work together.
- A single cell: it is the smallest living unit.
- An organ system: organs work together.
Maya puts body parts in the building order by measuring which is longest. What should she check instead?
- How much each body part weighs.
- What each body part is made of.
- Where each body part is found inside you.

Answer key

For grown-ups. Fold this page away before handing over the rest.

False · Most individual body cells are too small to see clearly with your eyes alone. A microscope makes them look larger.
A cell · A cell is the body's smallest living unit. Tissues and organs contain many cells.
Cell, tissue, organ, organ system · Cells form tissues. Different tissues form organs. Organs work together in organ systems.
An organ, such as the heart · Different tissues work together to form an organ. The heart is one example.
A tissue · A tissue is a group of similar cells working together. An organ contains different tissues.
It makes a small cell look larger. · A microscope makes tiny cells look larger. It does not turn a cell into a tissue or an organ.
An organ system: organs work together. · The heart and blood vessels work together in the circulatory system. Their team is an organ system.
What each body part is made of. · The building order describes how cells, tissues and organs fit together. What a part is made of helps identify its level. Its length does not.