Bodybuilders show off their muscles by a. activating their ...

[JMatthes]

Bodybuilders show off their muscles by
 
  a. activating their autonomic nervous system.
  b. willing the activation of their extensor muscles.
  c. willing the activation of their flexor muscles.
  d. simultaneously contracting their flexor and extensor muscles.
  e. ingesting large amounts of sympathomimetic drugs.

Question 2

Our body movements are mediated by the contraction of _______ muscle.
 
  a. intrafusal
  b. skeletal
  c. cardiac
  d. smooth
  e. non-striated

[alexanderhamilton]

Answer to Question 1

Answer: d. simultaneously contracting their flexor and extensor muscles.

Answer to Question 2

Answer: b. skeletal

[JMatthes]

Thanks for the timely response, appreciate it

[jackie]

Gracias!