Question

the muscle rectus abdominalis is named based on its orientation.
true
false
question 13
the cause of fatigue in muscles is build up of :
carbonic acid
lactic acid
oxygen
creatine phosphate
question 14
a muscle group that works with and assists the action of a prime mover is a(n):
fixator only
antagonist and synergist
antagonist and fixator
synergist only
antagonist only

Explanation:

• For the first question, "rectus" means straight in Latin, referring to the straight - orientation of the rectus abdominis muscle.
• For the second question, during strenuous exercise, when oxygen is limited, muscles perform anaerobic respiration, producing lactic acid which causes fatigue.
• For the third question, a synergist muscle group works with and assists the action of a prime mover. A fixator stabilizes the origin of the prime mover, and an antagonist opposes the action of the prime mover.

Answer:

• First question: True
• Question 13: B. lactic acid
• Question 14: D. synergist only