Science - Structure and Function of living things Study Guide

Why does your pupil get larger when the room is dark?

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How do nocturnal animals see better in the dark than we can?

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Why does it sometimes look like people have red eyes when their picture is taken using a camera's flash?

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What is the name of the plant part that carries water from the plant's roots to its leaves?

• A. fruit

• B. flower

• C. seed

• D. Stem

Doug claims that the human body "works a lot like a robot." What are some ways that our bodies are similar to robots?

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Why do you think that scientists find dissection useful for learning how the body works?

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Make a drawing that explains how biceps move your lower arm. (Use words and arrows to help you explain it.)

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Would you be able to move if you didn't have bones? Why or why not?

William loves muffins. One day, when he came back from school, he found that the kitchen was filled with the smell of some fresh muffins that his mother had bought at a bakery. As soon as he smelled the muffins, his mouth began watering. Why did his mouth water?

• A. William's brain sent a signal directly to his mouth, causing his mouth to water.

• B. William's nose sent a signal directly to his mouth to begin watering.

• C. William's nose sent a signal to his brain, which then sent a signal to his mouth that made it water.

• D. William's brain sent a signal to his nose, which then sent a signal to his mouth to begin watering.

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When your eye sees a pencil, it sends a signal to your brain. Your brain then signals muscles in your hand and arm, and you can reach and pick up the pencil. In the process that was described, which was a sensory receptor?

• A. brain

• B. eye

• C. stomach

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