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WorksheetsMuscle Fatigue Lab Check Questions
Total questions: 20
Worksheet time: 15mins
Which cell organelle provides energy for muscle contraction?
lysosome
nucleus
endoplasmic reticulum
mitochondria
A weightlifter is using heavy weights in short bursts for a competition. Because his muscle cells are not able to take in enough oxygen to make very much ATP the weightlifter begins to get fatigue in his muscles. Which of the following processes is most likely going on in the muscles of the weightlifter as he competes in his event?
As the cells run out of oxygen they switch to anaerobic respiration (fermentation), which allows the cell to make small amounts of ATP in the absence of oxygen.
As the cells run out of oxygen, they die off gradually and the weightlifter's muscles have fewer contracting muscle cells.
The cells will never run out of oxygen if the weightlifter is breathing.
As the cells run out of oxygen, they will continue to make the same amount of ATP, since oxygen is not required to make ATP.
Which following statements accurately explain the phenomenon of muscle fatigue?
(Choose all that apply)
T-tubules no longer transmitting action potential.
Ionic disturbances interfering with calcium release from the sarcoplasmic reticulum (SR).
Lactic acid build up in muscles causing extreme pain.
Muscle has used most of its available energy.
The only reason our Muscles get fatigued (tired) is because of the build up of lactic acid.
True
False
The signals that travel from the brain to the muscles to tell them when to contract (tighten up) happen in a fraction of a second.
True
False
The energy used to power the contraction of a muscle comes from a molecule called _______________
ATP
sodium
phosphorous
dextrose
Every time a muscle contracts, energy in the form of ATP gets used up.
True
False
As muscles get more tired through repeated contractions, waste products like ______________________ are generated (produced).
carbon dioxide
uric acid
creatine
lactic acid
Once muscle cells use up ATP as they contract repeatedly, they cannot make any more.
True
False
Over the course of repeated muscle contractions, there may not be sufficient concentrations of potassium, sodium or calcium ions immediately available near the muscle cell membrane to reset the system properly.
True
False
A muscle will ALWAYS be able to generate the action potential necessary to contract a muscle just as long as the brain sends the signal to the muscle to contract.
True
False
Even when ions like sodium, potassium or calcium are depleted in or around the muscle cell, these ions are plentiful elsewhere in the body. And with a little time, they will flow back to the areas where they're needed.
True
False
If you pause and rest after fatiguing (tiring) your muscles, ions like sodium, potassium, and calcium will replenish throughout the muscle eventually.
True
False
An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin.
Muscle fatigue occurs during this activity when
carbon dioxide is used up in the muscle cells
simple sugar is converted to starch in the muscle cells
proteins accumulate in mitochondria in the muscle cells
lack of certain materials used to produce ATP
Avery is studying how muscles work and learns that for muscle contraction to occur, the muscle fiber requires calcium, as well as this substance which provides the cell with energy:
ATP
Epinephrine
Bicarbonate
Lipase
After strenuous exercise, a muscle cell would contain decreased amounts of ______ and increased amounts of ______ ____
glucose; ATP
ATP; glucose
oxygen; lactic acid
lactic acid; ATP
Why do you need oxygen?
Which of the following statements is true about the role of ATP in muscle contraction?
ATP is only needed for muscle relaxation.
ATP is not involved in muscle contraction.
ATP is continuously required to sustain muscle contraction.
ATP is only needed at the start of muscle contraction.
Which ion is crucial for muscle contraction and is released from the sarcoplasmic reticulum?
Magnesium
Calcium
Potassium
Sodium
