Cells and life lesson one

How many cells are estimated to be in the human body?

• 50 trillion

• 50 billion

• 50 million

• 50 quadrillion

Which of the following is an example of a single cell that can be seen with the naked eye?

• Nerve cell

• Bacterium

• Human skin cell

• Yolk of a chicken egg

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What is a unique feature of a human sperm cell?

• It can grow

• It can change shape

• It can swim

• It can produce energy

What do cells in the heart work together to do?

• Make food

• Pump blood

• Create energy

• Grow

What are cells often referred to as?

• Building blocks of life

• Tiny organisms

• Parts of a house

• Living rooms