Irwin Human Body Review

Why do humans require many different types of cells to survive?

• Human cells are identical and work together to perform the same function.

• Human cells are specialized and work together to perform the same function.

• Human cells are identical and work independently to perform different functions.

• Human cells are specialized and work independently to perform

  different functions.

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How are multicellular and unicellular organisms different?

• Multicellular organisms have more than one cell and are smaller than unicellular organisms.

• Unicellular organisms have more than one cell and are larger than multicellular organisms.

• Unicellular organisms have one cell and are smaller than multicellular organisms.

• Multicellular organisms have one cell and are larger than unicellular organisms.

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Which is an example of a single-celled organism?

• fish

• tree

• fungi

• human

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An organism can only be seen through a microscope. Which is most likely true of that organism?

• It is a plant.

• It is an animal.

• It is multicellular.

• It is single-celled.

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Which best describes a multi-celled organism?

• complex

• basic

• uniform

• simple

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Max is comparing the characteristics of different types of organisms. Which best describes a difference between insects and bacteria?

• Insects are made of one cell, while bacteria are made of many cells.

• Bacteria are made of one cell, while insects are made of many cells.

• Insects require energy to perform life functions while bacteria do not.

• Bacteria require energy to perform life functions while insects do not.

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Which major respiratory organ does the skeletal system protect?

• esophagus

• stomach

• lungs

• heart

Which best describes the relationship between the nervous system and the muscular system?

• The brain is protected by muscle.

• Muscles cause the heart to contract.

• The brain controls muscle movement.

• Muscles move food through the stomach.

Which two systems work together to help a person stand erect?

• skeletal and muscular

• skeletal and digestive

• skeletal and respiratory

• skeletal and cardiovascular

Which best describes the purpose of the cardiovascular system?

• It delivers blood to the body’s tissues.

• It supplies stability to the skeleton.

• It delivers food to power the body.

• It supplies oxygen to the body.