Anatomy and Physiology 2-1 thru 2-3

What is the branch of science that deals with the composition and characteristics of chemicals?

• Astronomy

• Chemistry

Why is a knowledge of chemistry necessary for understanding physiology?

• Because it explains the theory of relativity

• Because chemicals participate in body processes

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What are our foods, liquids, and medications composed of?

• Chemicals

• Metals

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What are cells and their organelles assemblies of?

• Molecules

• Ions

What is matter?

• Anything that has weight and takes up space

• Anything that does not take up space

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What are elements?

• The smallest units of matter with specific chemical properties

• Only gases

Which elements are most abundant in living organisms?

• Oxygen, carbon, hydrogen, and nitrogen

• Sodium, potassium, calcium, and magnesium

What are atoms?

• The smallest unit of an element

• A type of molecule

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What are chemical bonds?

• The formation of new elements

• Attractions between two or more atoms

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Which element makes up the largest percentage of the human body by weight?

• Carbon

• Oxygen

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