In the human body, most of the lever systems formed by muscles pulling on bones are what class?
A. 1st class
B. 2nd class
C. 3rd class
D. no particular class is dominant
Answer: C
In the human body, most of the lever systems formed by muscles pulling on bones are what class?
A. 1st class
B. 2nd class
C. 3rd class
D. no particular class is dominant
Answer: C