lactic acid

True or False: Running out of energy or Lactic Acid build up are the only factors that cause muscle fatigue.

• True

• False

A muscle's ability to resist fatigue is very much related to :

• How much sugar you have eaten

• the muscles ability to receive signals from the brain

• How much protein you have eaten

• None of the above

What are motor neurons?

• They're the part of the brain responsible for involuntary impulses.

• It's the part of a car, SUV, or pick-up truck that makes it go fast, slow, or stop.

• They're long thin cells which carry signals from the brain to the muscles.

What is acetylcholine?

• cells that are between the neurons

• a chemical the brain produces causing fatigue.

• a neurotransmitter that is contained in a motor neuron on one side of the gap.

What's on the other side from the neurotransmitter?

• another neurotransmitter

• ions (i.e. charged particles)

• more acetylcholine

Which of the following is correct about the flow of ions in/out of the muscle cell prior to contraction?

• Sodium goes in, Potassium goes out

• Sodium goes out, Potassium goes in

The release of calcium within the muscle causes:

• muscle fibers to disenegrate

• muscle fibers to lock together

• muscle fibers to run away from each other

When muscles contract:

• ATP is used and Lactic Acid is released

• Stomach Acid is released 

• None of the above

Which of the following is the biggest factor in muscle fatigue?

• insufficient concentrations of potassium, sodium and calcium ions

• ATP energy gets used up

• ions drift from the muscle cells' membranes

• lactic acid builds up

According to the narrator in the video, what do you have to do to alleviate muscle fatigue?

• rest a while

• keep working through it

• drink gatorade or muscle milk