Tag: muscle features

Questions Related to muscle features

Rigor mortis is 

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Contraction of muscles after death

  2. Contraction of muscles before death

  3. Shivering of muscles

  4. None of the above

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Correct Option: A
Explanation:

Rigor mortis is stiffening of the body caused by contraction of muscles after death. In humans it occurs four hours after death. Due to absence of oxygen after death, the ATP is not formed which is required for separation of actin and myosin. When oxygen is no longer present, the body may continue to produce ATP via anaerobic glycolysis. When the body's glycogen is depleted, the ATP concentration diminishes, and the body enters rigor mortis because it is unable to break those bridges. So, the correct answer is 'Contraction of muscles after death'.

TLV' stands for

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Temperature limit value

  2. Threshold Limit Value

  3. Tropical limit value

  4. Time Limit value

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Correct Option: B

Exposure to $H _{2}S$ for a short period, causes

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Vomiting

  2. Mortality

  3. Fatigue

  4. Unconsciousness

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Correct Option: C

Contraction of shortest duration is of

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Heart

  2. Eyelids

  3. Arm

  4. Jaws

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Correct Option: B
Explanation:

The external muscles of the eye are conspicuously large and strong in relation to the small size and weight of the eyeball. It is frequently said that they are the strongest and fastest contracting muscles due to the constant blinking action they have to do. Eye movements do require high speed movements, and eye muscles are exercised continuously even during rapid eye movement of sleep. 

When supra maximal stimulus is given then

zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

  1. Muscle contraction is more than normal

  2. Muscle contraction is less than normal

  3. Muscle contraction is below average

  4. None of the above

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Correct Option: A
Explanation:

At the maximal stimulus, all motor units are recruited. All muscle cells in the whole muscle are contracting. Any stimulus above the maximal stimulus is called a supramaximal stimulus (voltage) and the tension will not increase beyond that elicited by a maximal stimulus. Thus, the correct answer is option A.