rafi_mokdadLv1

13 Nov 2022

 

I need answer for these questions

The vastus lateralis is almost composed of entirely type I (slow-twitch glycolytic) and type IIA (fast-twitch glycolytic oxidative glycolytic) fibers. In many samples of this muscle no type NB fibers (fast-twitch glycolytic) are found. There are nearly twice as many type I fibers compared to type IIA fibers. In the vastus lateralis, this is reversed (there are more type IIA fibers versus type I fibers).

   (a) What type of lever is the vastus medialis? Support your answer with a free body diagram.

   (b) The vasti muscles are used both for sit-to-stand AND stand-to-sit movements. Which of these two tasks represents a concentric contraction and which represents an eccentric contraction?

   (c) Which muscle (vastus lateralis or medialis) do you think is more important for doing a slow, controlled stand-to-sit transition?

   (d) If you witnessed your grandfather "plopping" (doing an uncontrolled sit) into a chair, would you recommend giving him eccentric or concentric strengthening exercises for his vasti muscles? Jus your answer.

 

Extra Credit ( 5 points):

Tendons and ligaments serve distinctly different purposes, even though they are usually located in close proximity in the body.

   (a) Describe the specific function of each tissue (tendon and ligament)

   (b) Explain how the composition of each tissue relates to its function