
Why do our muscles get tired?
Interactive Video
•
Science
•
8th Grade
•
Medium
Ana Dahl
Used 1+ times
FREE Resource
4 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step that causes a muscle to contract?
The muscle runs out of energy.
The brain sends a signal through motor neurons.
Lactic acid builds up in the muscle.
Calcium is released inside the muscle cell.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the charged particles (ions) on the muscle cell membrane when it receives a signal to contract?
Sodium ions flow out, and potassium ions flow in.
Both sodium and potassium ions flow out.
Both sodium and potassium ions flow in.
Sodium ions flow in, and potassium ions flow out.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What molecule is responsible for providing the energy needed for muscle contraction and for resetting the balance of ions?
Acetylcholine
Lactic acid
ATP
Calcium
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary reason a muscle becomes fatigued and can no longer contract effectively?
The muscle runs out of ATP.
Too much lactic acid accumulates in the muscle.
There are not enough necessary ions near the muscle cell membrane to generate an electrical signal.
The brain stops sending signals to the muscle.
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