Structures & Functions of Living Things Unit Test

Which system functions to transport messages between the brain and other parts of the body?

• respiratory system

• nervous system

• digestive system

• skeletal system

Which of the following statements best describes unicellular organisms?

• Unicellular organisms have transport systems between cells.

• Unicellular organisms have many cells that must work together to perform life processes.

• Unicellular organisms are a single cell that perform all life processes.

• Unicellular organisms live only inside other living organisms.

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Which body system is made up of the following structures: mouth, esophagus, stomach, and intestines?

• digestive system

• muscular system

• respiratory system

• cardiovascular system

Which two body systems function (work together) to help a person walk, run, jump, and swim?

• digestive & muscular systems

• circulatory & respiratory systems

• nervous & digestive systems

• skeletal & muscular systems

What is the function of the cardiovascular system?

• to provide protection to the body's organs

• to transport needed substances throughout the body and carry away wastes

• to provide movement to body parts

• to break food down into substances the body can use

Which system functions to take oxygen into the body and release carbon dioxide from the body?

• nervous system

• digestive system

• respiratory system

• skeletal system

Why have multicellular organisms developed transport systems?

• Cells within a multicellular organism are too small for a direct exchange of substances.

• Cells within a multicellular organism are too far away from the environment for a direct exchange of substances.

• Cells within a multicellular organism are too large for a direct exchange of substances.

• Multicellular organisms have not developed transport systems.

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Which of the following is an example of a multicellular organism?

• human

• flower

• fish

• all of the above

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What is the function of the heart in the circulatory system?

• It pumps blood through vessels throughout the body.

• It helps the body make more blood cells.

• It forms a network of vessels throughout the body.

• It protects the bones of the skeletal system.

Leo is observing a sample of pond water using a microscope. He sees an organism moving around in the water and thinks it might be a multicellular organism. Which of the following characteristics of the organism make it most likely to be a multicellular organism?

• The organism is made of many cells.

• The organism has cells that perform specialized functions necessary for life.

• The organism has developed transport systems.

• All of the above.

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