Muscle fatigue occurs due to accumulation of___________?

Related Mcqs:

1. Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.

   A. Binding sites of actin get attached to the myosin head.
   B. Troponin uncovers the actin binding sites.
   C. Tropomyosin gets removed from the binding sites of actin filaments.
   D. Ca2+ goes back inside sarcoplasmic reticulum.

2. Which of the following statement about fatigue is correct?

   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

3. Accumulation of lipid molecules in brain cells lead to____________?

   A. paralysis
   B. oedema
   C. mental retardation
   D. all of these

   Submitted by: Maryam Aftab

4. Accumulation of lipid molecules in brain cells lead to__________?

   A. paralysis
   B. oedema
   C. mental retardation
   D. all of these

   Submitted by: Maryam Aftab

5. Lungs are spongy due to the presence of million of___________?

   A. Air sacs
   B. Alveoli
   C. Bronchioles
   D. Parabronchi

6. Blood does not coagulate inside the body due to the presence of___________?

   A. Haemoglobin
   B. Fibrin
   C. Heparin
   D. Plasma

   Submitted by: Yaseen Nohri

7. Ozone depletion occurs commonly due to_______________?

   A. Carbon dioxide
   B. Chlorofluorocarbons
   C. UV rays
   D. Deforestation

8. Detachment of myosin head and actin in rigor mortis occurs due to__________?

   A. stored ATP in body
   B. hypercalcemia
   C. autolysis in body
   D. hyperactivity of mitochondria

   Submitted by: Maryam Aftab

9. Which of the following statements is incorrect about skeletal muscle fibers?

   A. They are multinucleated.
   B. They are 10 – 100 ?m in diameter & surrounded by sarcolemma
   C. They contain O2 storing molecules called hemoglobin.
   D. Their cytoplasm contains high concentration of carbohydrates

10. In an annelids, the contraction of circular muscle results in___________?

    A. Lengthening of the body.
    B. Shortening of the body.
    C. Widening of body
    D. Thinning of body