Front

What are the smallest units or parts of living things?

Back

Cells are the body's building blocks.

Front

What is the main function of the respiratory system?

Back

The main function of the respiratory system is to take in oxygen and exhale waste like carbon dioxide.

Front

Which system senses pain and sends signals to the brain and spinal cord?

Back

The nervous system.

Front

What system supplies the body with oxygen and rids it of carbon dioxide?

Back

The respiratory system.

Front

What system does the heart pump blood through?

Back

The circulatory system.

Front

What is the primary function of the circulatory system?

Back

To transport blood, nutrients, and oxygen throughout the body.

Front

What are tissues?

Back

Groups of similar cells that perform a specific function.

Front

What is the role of the immune system?

Back

To protect the body from infections and diseases.

Front

What is the function of the excretory system?

Back

To remove waste products from the body.

Front

What is homeostasis?

Back

The process by which the body maintains a stable internal environment.