Human Body Systems

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.

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

• circulatory

• digestive

• nervous

• skeletal

How are single-celled organisms and multi-celled organisms similar?

• Both need food for energy and growth.
• Both have a skeletal system for support.
• Both require the interaction of many cells to survive.
• Both are able to carry out all life functions in only one cell.

Which organism performs all life processes in one cell?

• grass
• bacteria
• mushroom
• butterfly

Which system is most closely associated with the brain?

• nervous
• muscular
• circulatory
• respiratory

Fungi and bacteria are both single-celled organisms. What do they most likely have in common?

• Both fungi and bacteria are large organisms.
• Both fungi and bacteria can carry out all life functions in their one cell.
• Both fungi and bacteria need sunlight and nutrients from the soil to be able to grow.
• Both fungi and bacteria are highly specialized to do only one job so they must work with other cells to obtain food.

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 organisms are capable of surviving as a single cell?

• bacteria
• humans
• plants
• fish

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 of the following best describes the job of the skeletal system?

• Gives shape and support to the body.
• Sends messages from the stomach to the brain.
• Brings in and breaks down all nutrients for the body.