Tag: features of a muscle

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Questions Related to features of a muscle

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

Muscle fibres that show, presence of well developed sarcoplasmic reticulum and are easily fatigued during exercise are likely to be in close association with

  1. Limb bones

  2. Wall of intenstine

  3. Heart

  4. Wall of fallopian tube
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Skeletal muscles show muscle fibres having well developed sarcoplasmic reticulum these muscles are easily fatigued during exercise. Skeletal muscles show voluntary movements.  These can be found in close association with limb bones.

So, the correct answer is 'Limb bones'.

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

Muscles, which are immune to fatigue, are

  1. Striped muscles

  2. Cardiac muscles

  3. Jaw muscles

  4. Skeleton muscles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The internal movements are performed by the involuntary muscles. The involuntary muscles function on their own and cannot be controlled willingly. The cardiac muscles are the involuntary muscles which are responsible for the pumping of the heart. The heart pumps and supplies the oxygenated blood to the different tissues in the body. The smooth muscles are responsible for carrying out peristalsis in the tube like structures of the alimentary canal.

Thus, the correct answer is option B. 

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

Which of the following type of muscles are not fatigued soon?

  1. Cardiac muscle

  2. Smooth muscle

  3. Voluntary muscle

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The correct option is D.

Cardiac and smooth muscle are not fatigued soon. Muscle fatigue is a symptom that decreases our muscles ability to perform overtime. 
Cardiac muscles, In smooth muscle myosin, the rate of ATPase activity is 10 to 100 slower than in skeletal muscle myosin. 

It must also be noted that nerve stimulation can cause a excitation or inhibition of the muscle cell.

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

Feeling of fatigue after running fast for some time is due to

  1. Loss of energy

  2. Accumulation of lactic acid in muscles

  3. Formation of succinic acid

  4. Formation of biuret crystals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Generally, the glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for the muscle contraction but during vigorous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid.
  • Feeling of fatigue after running fast for some time is due to the accumulation of lactic acid in muscles.
  • So, the correct answer is 'Accumulation of lactic acid in muscles'.
Multiple choice zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

Anaerobic breakdown of glycogen due to repeated activation of muscles leads to accumulation of

  1. Uric acid

  2. Phenylalanine

  3. Lactic acid

  4. Glutamic acid

  5. Tyrosine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The body prefers to generate most of its energy using aerobic methods. During physical exercise such as lifting heavy weights, energy production is faster than our bodies can adequately deliver oxygen. In those cases, the working muscles generate energy anaerobically. This energy comes from glucose through a process called glycolysis, in which glucose is broken down or metabolized into a substance called pyruvate. When the body has plenty of oxygen, pyruvate is shuttled to aerobic pathway to be further broken down for more energy. But when oxygen is limited, the body temporarily converts pyruvate into a substance called lactate and accumulates in the muscle. 

So, the correct answer is 'Lactic acid'.

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

Substance that accumulates in a fatigued muscle is

  1. Pyruvic acid

  2. Lactic acid
  3. CO$ _2$

  4. ADP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Generally, the glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for the muscle contraction but during vigorous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid. Hence Substance that accumulates in a fatigued muscle is lactic acid.
So, the correct answer is 'Lactic acid'.
Multiple choice zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

When  muscles begin converting glucose into lactic acid?

  1. Muscles run out of oxygen

  2. Accumulation of creatine in the muscles

  3. Muscle collapse

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • When you exercise, your muscles move more vigorously than when you are at rest. Their metabolic rate increases. 
  • They need more energy, so they produce more of the chemical energy molecule ATP. 
  • Your muscles begin converting glucose into lactic acid instead of energy when anaerobic exercise takes over, power output drops and fatigue sets in. Hence, when Muscles run out of oxygen muscles begin converting glucose into lactic acid.
So, the correct answer is 'Muscles run out of oxygen'.

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

During strenuous exercise, glucose is converted into

  1. Glycogen

  2. Pyruvic acid

  3. Starch

  4. Lactic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Generally, the glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for the muscle contraction but during strenuous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid.Hence during strenuous exercise,glucose is converted into lactic acid.

So,the correct answer is 'Lactic acid'.

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

Panting after vigorous exercise is due to

  1. Oxygen debt

  2. Continuity of deep breathing even after exercise

  3. Continuity of mouth breathing started during exercise

  4. Requirement of rapid dissipation of energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • During a vigorous physical exercise, lactic acid and carbon dioxide are formed in the muscles of the body.
  • The production of lactic acid can be prevented by the flow of required oxygen to the muscles thus, our body uses more oxygen than replenished.
  • Therefore, after a vigorous exercise people pant due to to decrease in the oxygen level in the body.
  • So, the correct answer is 'Oxygen debt'.
Multiple choice zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

All or none law is not applicable for

  1. Whole skeletal muscle

  2. Single skeletal muscle

  3. Whole cardiac muscle

  4. Single smooth muscle fibre
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All or none law is the principle that states that the strength by which a muscle fiber responds to a stimulus is independent of the strength of the stimulus. If that stimulus exceeds the threshold potential, the muscle fiber will give a complete response, otherwise, there is no response. 

Each muscle fiber is innervated by each nerve terminal or a nerve terminal innervates 2 or 3 muscle fibers. So their response is not related to others. The all or none law is seen is single fibers of skeletal muscles and smooth muscles but not the whole fiber. Whereas the cardiac muscle innervation is continuous and the whole muscle act as a single unit. So the whole cardiac muscle is applicable to all or none law. 
So the correct option is A.