Chapter 9, Problem 9.4a
Chris is training for his black belt in karate and is working on developing a stronger punch. Which muscles do you recommend that he strengthen to improve his punch? Explain.
Video transcript
Elise is a competitive gymnast who strained muscles in her left lower limb doing a tumbling pass. She has pain with extension of her leg and inversion of her foot. Which muscles did she potentially strain?
The action of the biceps brachii muscle on the hinge joint of the elbow is an example of which kind of lever system?
a. First class
b. Second class
c. Third class
d. Fourth class
Why do the three parts of the trapezius muscle have three different actions?
Which function is being fulfilled by a muscle that holds a bone steady during movement?
a. Antagonist
b. Synergist
c. Supinator
d. Fixator
Explain why strengthening the levator ani muscle may help improve bladder and bowel continence (voluntary control over urination and defecation).
Ms. Hendrix suffered a severe hip fracture that required hip replacement surgery. After an extended recovery period, she is undergoing physical therapy to regain strength and mobility.
b. Which muscles were likely affected by the hip replacement surgery, and to which parts of the bone do they attach?