1 - Actin has a strong affinity to myosin and readily combines with it to form actomyosin but this is inhibited by:
Troponin through its Tpc subunit
2 - After death rigor mortis occurs in the muscles because:
Actomyosin ADP complex is not broken dur to lack of supply of ATP as oxygen and other substrates for its synthesis are not present
3 - Besides ATP the other sources of providing energy for muscular contraction are:
Both (a) & (b)
4 - Chief source of energy for muscle contraction is:
Glycogen
5 - Contraction and relaxation phase of a muscle is called:
Twitch
6 - Cross bridges are found on:
Myosin
7 - Dragging of actin filaments towards 'M' line is termed as:
Power stroke
8 - During biochemical events or muscle contraction which of these processes occur:
All of these processes
9 - During first stage of breakdown of glycogen which of these occur:
Glycogen ? formation of glucose-6-phosphate
10 - During muscle contraction:
Actomyosin contracts so that cross bridges tilt dragging filaments of actin towards 'M' line
11 - During recovery phase of muscle contraction the processes occurring are:
All of these
12 - During relaxation the calcium ions are:
Forced back from sarcoplasm to sarcoplasmic reticulum
13 - Flexing or bending of our arm is done by:
Biceps
14 - Formation of lactic acid from pyruvic acid during muscle contraacton is catelyzed by which of these enzymes:
Lactic dehydrogenase
15 - Function of boosters in the contraction of cardiac muscles is performed by:
Intercalary discs
16 - Functional unit of contractile system in a striped muscle is:
Sarcomere
17 - How much lactic acid formed is broken by oxidation to form CO2 and water:
1/5 part
18 - How much lactic acid formed is resynthesized into glycogen:
4/5 part
19 - If a contracting muscle is given a second stimulus during its contraction phase then it is seen to produce 'M' curve on kymogram. This phenomenon is termed:
Summation
20 - In which of these conditions the muscle offers no contraction:
Fatigue
21 - In which of these phenomenon we get few initial sequentially increasing curves on kymogram if we stimulate a muscle periodically while permitting its normal relaxation:
Treppe
22 - M' curves on kymogram are seen during:
Summation
23 - Muscles are fatigued by accumulation of:
Lactic acid
24 - Muscular contraction involves which of these events:
Both (a) & (b)
25 - Paralysis occurs in the muscles by:
Cut off in its motor nerve supply
26 - Refractory period in frog's muscles is about:
None of these
27 - Refractory period in muscles of man is:
None of these
28 - Shivering of body and clattering of teeth in cold is a method for:
Production of heat by muscular contraction
29 - Shivering of body and clattering of teeth in winters is associated with:
Thermoregulation
30 - Sliding filament theory was proposed by:
H.E. Husley
31 - Spur-like structures are found in the molecule of:
Myosin
32 - Straightening of our flexed arm is done by:
Biceps which extends from shoulders to radius
33 - The 'A' band in myofibril occupies:
2/3rd of length of sarcomere so that muscle shortens by 1/3rd of its length during contraction
34 - The cause of muscular tentany is:
Deficiency of parathyroid hormone
35 - The contraction of of a muscle is caused by:
Actomyosin
36 - The decomposition of lactic acid is done by:
Both of these processes
37 - The energy required for muscular contraction is derived from:
ATP
38 - Troponin subunit Tpc inhibits actomyosin formation by:
Binding with Ca++ ions
39 - Under which of these disorders the muscle remains atrophied for a long time:
Paralysis
40 - Upwards and downwards rotation of body parts is done by:
Pronators and suppinators
41 - When a muscle is repeatedly stimulated during its contraction period without permitting relaxation for a very long time it does not relax. This stage is called:
Tetany
42 - Which of these are examples of antgonistic muscles in our body:
All of these
43 - Which of these are released before muscle contraction from sarcoplasmic reticulum:
Calcium ions
44 - Which of these muscle respectively flex and straighten our arm:
Biceps and triceps
45 - Which of these processes mark the beginning of muscular contraction:
Release of calcium ions from sarcoplasmic reticulum
46 - Which of these proteins are attached with actin of myofibril:
Both (a) & (b)
47 - Which of these reactions are correct:
Creatine phosphate ? Creatine + H3PO4 ADP + H3PO4 ? ATP
48 - Which of these structures over myosin help in contraction of the muscle fibre:
Cross bridges over spur
49 - Which of these substances on accumulation causes muscular fatigue:
Lactic acid
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