Stimulation of a muscle fiber by a motor neuron occurs at:
1. the neuromuscular junction
2. the transverse tubules
3. the myofibril
4. the sarcoplasmic reticulum
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a healthy person, the red muscle fibres appear red due to stored
1. Carboxyhemoglobin
2. Carbaminohemoglobin
3. Myoglobin
4. Erythropoietin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following property cannot be attributed to white fibers?
1. Fewer mitochondria
2. Anaerobic process for energy
3. Sarcoplasmic reticulum is high
4. More quantity of myoglobin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf production of pyruvic acid by anaerobic metabolism in a muscle is faster than it can be utilized, the surplus is converted to:
1. lactic acid
2. adenosine diphosphate
3. carboxylic acid
4. creatine phosphokinase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRed muscle fibres differs from white muscle fibres in having
1. More sarcoplasmic reticulum
2. Less myoglobin content
3. More number of mitochondria
4. High lactic acid due to anaerobic oxidation
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHypocalcemia may lead to:-
1. Kidney stones
2. Cholelithiasis
3. Stronger muscle contractions
4. Tetany
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyArrange the following events involved in muscular contraction
(i) Action potential enters muscle fibre through T-tubules
(ii) Ca2+ binds with troponin-C
(iii) Actomyosin cross bridge formation
(iv) Sliding of thin myofilament along the thick myofilament
(v) Exposure of active sites on actin filaments
(vi) Release of Ca2+ from sarcoplasmic reticulum
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the incorrectly matched pair:
Disease | Cause | |
1. | Myasthenia gravis | Antibodies against neuromuscular junction |
2. | Tetany | Hypocalcemia |
3. | Osteoporosis | Hypoparathyroidism |
4. | Gout | Accumulation of uric acid crystals |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is true about the white muscle fibers?
1. Myoglobin content is high
2. They have a large number of mitochondria
3. They depend on anaerobic process for energy
4. They are adapted for slow sustained activities
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch each item in Column I with one item in Column II and choose your answer from the codes given below:
Column I | Column II | ||
I. | Influx of sodium | 1. | Original establishment of RMP |
II. | Efflux of potassium | 2. | Repolarization |
III. | Na+/K+ pump | 3. | Depolarization |
IV. | Ca++ | 4. | Plateau in cardiac muscles |
Codes :
I | II | III | IV | |
1. | 3 | 2 | 4 | 1 |
2. | 2 | 1 | 4 | 3 |
3. | 2 | 1 | 3 | 4 |
4. | 3 | 2 | 1 | 4 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology