Cells "R" Us
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
