How Body Systems Work With Each Other

Which is an example of a single-celled organism?

• amoeba

• insect

• fish

• worm

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Why do multicellular organisms need transport systems?

• Most have cells that are not able to exchange gases with the outside environment.

• Most have cells that are unable to grow and survive in their environment

• Most have cells that need food from sources outside their environment

• Most have cells that require more energy to survive than single-celled organisms.

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Which is a function of the cardiovascular system?

• to move water throughout the body

• to provide structural support for the body

• to eliminate waste from the body

• to transport gases throughout the body

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

• circulatory system

• digestive system

• muscular system

• nervous system

Which statement best describes a bacterial cell?

• It contains more than one cell.

• It is a complete organism.

• It is part of a larger organism.

• It contains different kinds of cells.

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

• skeletal system

• circulatory system

• respiratory system

• muscular system

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

A scientist is trying to decide whether an organism is unicellular or multicellular. Which information would help the scientist most to make her decision?

• size of the cells of the organism

• what the organism eats

• how many types of cells are in the organism

• how fast the organism grows

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

• circulatory

• digestive

• nervous

• skeletal

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