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Lesson 7 Crossword

Across
Breathing in oxygen
The system that provides structor and support
Muscles that aids in breathing
Dense connective tissue found at the end of bones
Muscle found in the heart
Breathing carbon dioxide out
Muscle found in the intestines
The process taking in oxygen and releasing carbon dioxide
Cells, _______, Organs, Organ System
Dense outer layer of bones
Down
System that deal with our hair, skin, and nails.
Type of muscle that you can control
The only set of voluntary muscles
Contains the heart, blood vessels, and blood
Muscles we can not control
Connect bone to bone
The outer most layer of skin
Part of the skin that is not showing
More porous and lighter than regular bone
groups of organized tissues that serve the same function
Most basic unit of life