Cells "R" Us

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cell

A _____ is the smallest unit of structure and function of a living thing.

organs

An organ system is made of many _____ working together to do a special job.

cells

A tissue is made of a group of similar _____ working together.

organism

An ______ is a living thing that carries out its own life activities.

blood

An example of a cell is a _____ cell.

muscle

An example of a tissue is _____ tissue.

heart

An example of an organ is the ______.

cardiovascular

An example of an organ system is the _______.

human

An example of an organism is ______.

tissues

An organ is made of different _____ working together to do a special job.

cell

It takes about 20 seconds for a red blood __________ to circle the body.

human heart

The __________ beats more than 2-5 billion times in an average lifetime.

circulatory system

The __________ system of arteries, veins, and capillaries is about 60,000 miles long.

skin

The largest organ in the human body is the ______.

cells

human body is comprised of approximately 100 trillion


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