The Human Body

Which is an example of a single-celled organism?

• amoeba
• insect
• fish
• worm

Which characteristic do single-celled organisms and multicellular organisms have in common?

• Both have cells with specialized functions for each life process.
• Both perform all life processes within one cell.
• Both have a way to get rid of waste materials.
• Both are able to make food from sunlight.

Which example best shows structures that make up the digestive system in the human body?

• heart, blood, vessels
• nose, trachea, lungs
• brain, spinal cord, nerves
• esophagus, stomach, intestines

Which body system processes foods into a usable source of energy?

• circulatory
• digestive
• nervous
• skeletal

Which body system sends electrical signals to all other body systems?

• circulatory
• digestive
• muscular
• nervous

Which system of the human body provides protection to most of the major organs?

• circulatory
• respiratory
• muscular
• skeletal

Melissa accidentally touches a hot surface and then quickly pulls her hand away. Which two systems in the human body were involved with her action and reaction?

• nervous and muscular
• skeletal and circulatory
• nervous and respiratory
• muscular and respiratory

Which two body systems work together to take in oxygen and release carbon dioxide?

• muscular and skeletal
  
• digestive and circulatory
• respiratory and muscular
• circulatory and respiratory

How does the skeletal system benefit the nervous system?

• It protects the lungs.
  
• It protects the heart.
• It protects the brain and spinal cord.
• It protects the esophagus and stomach.

Sue and Allie read about different kinds of organisms. They read about an organism with a respiratory system, digestive system, skeletal system, and muscular system. Which can Sue and Allie most likely conclude about this organism?

• The organism is unicellular.
• This organism is microscopic.
• The organism is multicellular.
• The organism is simple.