What is the smallest unit of life in all living things?

• Cells

• Tissues

• Organs

• Organ systems

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Which type of organisms are made of a single cell functioning on its own?

• Bacteria

• Yeasts

• Animals

• Plants

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How many cells approximately make up the human body?

• 1 trillion

• 10 trillion

• 100 trillion

• 1000 trillion

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What is the main function of red blood cells?

• Transport oxygen

• Fight off infection

• Help form blood clots

• Release hormones

Which type of tissue is involved in movement?

• Muscle tissue

• Epithelial tissue

• Nervous tissue

• Connective tissue

What is the main function of epithelial tissue?

• Protection

• Secretion

• Absorption

• All of the above

Which organ is responsible for filtering blood?

• Liver

• Kidneys

• Heart

• Stomach

Which organ system is responsible for delivering oxygen to the body?

• Circulatory system

• Respiratory system

• Muscular system

• Digestive system

What is the basic function of muscles?

• Contract

• Pump blood

• Digest food

• Filter waste

Which system removes waste from the body in conjunction with the circulatory system?

• Excretory system

• Nervous system

• Respiratory system

• Digestive system