The Circulatory System

Humans are _____________, or made up of more than one cell.

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An adult human body has about ______ cells.

• 97 million

• 37 trillion

• 1.5 billion

• 9 quadrillion

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A human starts as _ ______ cell

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True or False: The very first cell grows and then divides to form more cells.

• True

• False

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Describe what specialized cells do

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Select all that apply: Different types of cells in the human body include...

• organ cells

• blood cells

• skin cells

• muscle cells

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Where aer fibroblasts cells found?

• Fat

• Eyes

• Skin

• Heart

True or False: Endothelial cells, make up the linings of white blood cells and of other body parts.

• True

• False

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______________ are special muscle cells found only in the heart.

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When many similar specialized cells are organized together, they form a system called a 

• Muscles

• Tissue

• Lipids

• Protiens

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