Cells and Body Systems

Laura is trying to identify a structure that she has found inside the cells she is studying. The structure looks like a large pool of water that takes up much of the cells space. Laura discovers that the structure is used to store and hold water for the cell. What structure has Laura found?

• chloroplast

• nucleus

• mitochondria

• large vacuole

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Structures in the human body work together to perform a function. The diagram below shows the organization of structures found in the human body. A picture of which of the following belongs in the box?

• organ system

• cell

• tissue

• organ

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Which choice shows the levels of organization in the human body from simplest to most complex?

• tissue – cell – organ – organ system

• cell – organ – organ system – tissue

• organ system – cell – tissue – organ

• cell – tissue – organ – organ system

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Below is an image of the respiratory system and the circulatory system. The two systems work together to carry oxygen to needed cells and carry away carbon dioxide from cells as waste. This process is the body's way of doing what?

• feeding the cells

• maintaining homeostasis

• maintaining a symbiotic relationship

• maintaining photosynthesis

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What happens as a result of homeostasis?

• The body balances on one foot.

• The body keeps its internal balance.

• The digestive system and the excretory system work separately.

• Humans produce other humans.

Which of the following is NOT a part of the cell theory?

• All living things are made of cells

• Cells are the smallest unit of life

• Cells must be studied with a microscope

• All cells come from other cells

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Homeostasis is the ability of living things to maintain a balanced internal environment. Deonte is practicing football on a hot, summer day. He takes frequent breaks to drink pure, fresh water. Why is it important for Deonte to drink water?

• Drinking water will give him more energy to replace the energy he has used while practicing

• Drinking water will replace water he loses through sweating and other bodily functions like breathing

• Drinking water will increase his internal temperature to match the outside temperature

• Drinking water isn't really important and just wastes practice time.

In order to maintain homeostasis, the systems of the human body work together to keep a constant internal temperature, Which of the following best describes how the human body response in a cold environment?

• The digestive system produces more hormones to warm the body

• The nervous system signals the muscles of the muscular system to contract and warm the body

• The circulatory system delivers less carbon dioxide to the muscular system. resulting in stiffening of the muscles

• The skeletal system produces more blood cells that circulate through the blood vessels, increasing the warmth of the body

The cell theory applies to all organisms, including the five shown. Which of the following statements, including these organisms, are an example of the cell theory?

• These organisms have cells that do not have a nucleus.

• These organisms are made up of one or more cells.

• The cells of these organisms undergo photosynthesis.

• The cells of these organisms are identical to each other.

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When you arrive home after a long day at school your stomach begins to growl and you feel hungry. You decide to go to the fridge to get a snack. This is an example of how your body systems work together to maintain homeostasis. What two systems are working together to make you feel hungry, make your stomach growl and make you get a snack?

• digestive and circulatory

• digestive and excretory

• digestive and nervous

• digestive and respiratory