Muscular System and Respiratory System
If you want to learn about the respiratory system click above me.
If you want to learn about the respiratory system click above me.
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INTRODUCTION HEADING there are 4 different parts about the circulatory system heart veins capillaries arteries if you want to lea...
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this helped me for the tricky things in life so now I know how to use it
Wow! 700 muscles in a human body! I can't believe that skeletal muscle tissue, blood vessels, tendons and nerves weighs half your body weight! I never knew that muscles are attached to the bones with tendons and muscles are made of thin cells called muscles fiber. I did not know that muscles are controlled by nerves by using the electrical signals. This is so exiting! I liked that you explained about the human muscular system and respiratory system! I can't believe that there are 3 types of muscles, the involuntary, smooth muscles involuntary and cardiac muscles. I didn't know any of any of these things! Thank you for telling me. Are liver's muscles?
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