Biology · General Awareness

Muscle Biology

836 Questions

Muscle biology covers the structures, functions, and contraction mechanisms of skeletal, cardiac, and smooth muscles. Test questions target filaments, stimuli, and specific muscle roles. A clear understanding helps secure marks in biology sections.

Skeletal muscle controlCardiac muscle propertiesMuscle contraction mechanismActin and myosin filamentsMuscle functions

Muscle Biology Questions

Multiple choice

Which of the following is incorrect, regarding skeletal muscle fibre?

  1. It is lined by sarcolemma

  2. It is syncitium

  3. Each fibre is made up of a number of myofibrils

  4. Each myofibril is multi-coloured

  5. Each muscle bundle contains a number of muscle fibres
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is the correct answer as this option is incorrect. Each myofibril has alternate dark and light bands. It is not multi-coloured.

Multiple choice

Which of the options is incorrect regarding skeleton muscles?

  1. They have striped appearance under microscope

  2. They are involved in change in body postures

  3. They are also known as striated, voluntary muscles

  4. They are found in the inner walls of hollow organs

  5. They are associated with skeletal components of the body
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer, as this option is incorrect. Visceral muscles are located in the inner walls of hollow visceral organs of the body as are the alimentary canal, reproductive tract, etc.

Multiple choice

Which of the following is the strongest muscle in the human body?

  1. Jaw muscle

  2. Bicep

  3. Tricep

  4. Heart

  5. Stomach
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The heart (cardiac muscle) is considered the strongest because it contracts continuously without rest throughout a lifetime. While the masseter (jaw) muscle generates more force per contraction, it cannot sustain this output continuously like the heart.

Multiple choice

The arrector pili muscle consists of:

  1. Straited muscle fibres.

  2. Smooth muscles.

  3. Cardiac muscle fibre.

  4. Sketelat muscle fibre.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

They are associated with the movements that are not under will.

Multiple choice

Which of the following is a component of myosin?

  1. Creatine

  2. 4-hydroxyproline

  3. γ-carboxyglutamate

  4. Desmosine

  5. 6-N methyl lysine
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

6-N methyl lysine is a component of myosin, which is the contractile protein found in muscles. 6-N methyl lysine is an amino acid which occurs naturally in biofluids of human beings.

Multiple choice

Match the following:

 
a. Cardiac muscles 1. They are found in the walls of alimentary canal and internal organs, ducts of glands and blood vessels.
b. Smooth muscles 2. They are found in the muscles of limbs, body wall, face, neck, tongue, pharynx and diaphragm.
c. Striated muscles 3. They are found in the walls of the heart.

  1. a - 3, b - 1, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 1, c - 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Cardiac muscles are found in the walls of the heart. Smooth muscles are found in the walls of alimentary canal and internal organs, ducts of glands and blood vessels. Striated muscles are found in the muscles of limbs, body wall, face, neck, tongue, pharynx and diaphragm.

Multiple choice

What is the connective tissue covering that encloses the muscle belly called?

  1. Fascicles

  2. Perimysium

  3. Endomysium

  4. Sarcolemma

  5. Epimysium
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Epimysium is a layer of connective tissue which ensheaths the entire muscle. It is composed of dense irregular connective tissue. It is continuous with fascia and other connective tissue wrappings of muscle including the endomysium and perimysium. It is also continuous with tendons where it becomes thicker and collagenous. The epimysium also protects muscles from friction against other muscles and bones.

Multiple choice

Consider the following statements:

  1. Muscular tissue covers the outer surface of the whole body.
  2. Cardiac muscles present in the heart are of involuntary nature.

Which of the given statements is/are correct?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is incorrect. Epithelial tissue covers the outer surface of the whole body. It also lines the internal organs, cavities and other parts of the body. Statement 2 is correct. Cardiac muscles are specialised involuntary muscles present in the heart. They help the heart to pump blood day and night.