Which of the following statement about fatigue is correct?
Correct answer: D. All of these
- A. The major event in it is accumulation of lactic acid.
- B. Lactic acid accumulation turns pH in acidic range leading to muscle ache.
- C. Ionic imbalance may also cause it.
- D. All of these
Explanation
Muscle fatigue may involve lactate and hydrogen ion accumulation, changes in pH, and ionic disturbances that interfere with excitation and contraction, so all the listed mechanisms are accepted at this level. The likely distractor is option a or b if a student treats one mechanism as the only cause of fatigue.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
Practise Support and Movement
738 free Support and Movement MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Muscle Contraction questions
Tetany is caused by__________?
Muscle fatigue occurs due to accumulation of___________?
Once an action potential reaches the membrane of a skeletal muscle fiber, what is the first event that occurs in the contraction process?
Rigor mortis i.e, stiffening of body after death results from__________?
What happens during muscle contraction to the length of each myosin and action filament?
If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules: