Organ Systems

Which system absorbs oxygen and releases carbon dioxide?

• respiratory
• excretory
• endocrine
• immune

Which system acts as a barrier from the sun and helps regulate body temperature?

• integumentary
• muscular
• digestive
• circulatory

This system transports oxygen and nutrients around the body.

• circulatory
• respiratory
• skeletal
• digestive

This system breaks down food into nutrients that the body can absorb.

• digestive
• excretory
• reproductive
• immune

This system fights pathogens (germs) and produces and stores white blood cells.

• immune
• muscular
• endocrine
• integumentary

This system supports the body and protects vital organs.

• skeletal
• muscular
• circulatory
• nervous

This system sends chemical messengers (hormones) that regulate growth, development, and metabolism.

• endocrine

• nervous

• immune

• skeletal

Which system sends electrical messages that helps control the body's responses to internal and external changes?

• nervous
• endocrine
• reproductive
• integumentary

Lungs are the primary organs of this system.

• muscular system
• nervous system
• circulatory system
• respiratory system

Which of these belongs in the least complex level of organization?

• earthworm

• digestive system

• skin cell

• stomach