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 part of human heart wall is made of involuntary cardiac muscle cells?

  1. Epicardium

  2. Atrium

  3. Endocardium

  4. Myocardium

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

It is the thick middle layer and muscular tissue of the heart that forms the bulk of the heart wall. Specially modified fibres of myocardial muscle constitute the conduction system of the heart including the sinoatrial node, the atrioventricular (AV) node, the AV bundle, and the purkinje fibres.

Multiple choice

Which of the following are cardiac muscles?

  1. Uninucleated and unstriated

  2. Unstriated and unbranched

  3. Branched and uninucleated

  4. Unbranched and multinucleated

  5. Branched and multinucleated
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer. Cardiac muscle cells have a branched shape so that each cell is in contact with three of four other cardiac muscle cells. Cardiac tissues are also smooth and uninucleated.

Multiple choice

Once a baby begins to walk, which motor system controls skeletal muscle tone and co-ordinates learned movement patterns?

  1. Skeletal system

  2. Extrapyramidal

  3. Pyramidal system

  4. Neuromuscular system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyramidal system is responsible for fine, isolated, precise and specific movements including gross, syngergic movements that require the activity of large groups of muscles. Thus, when a baby begins to walk, the pyramidal system controls skeletal muscle tone and co-ordinates learned movement patterns.

Multiple choice

Which of the following terms denotes the classification of muscles based on their functions?

There can be three types of muscles based on the structure of their fibres : 1) Striated/skeletal muscle 2) Smooth muscle 3) Cardiac muscle

  1. Tetanus

  2. Trapezius

  3. Extensor

  4. Treppe

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

This denotes the type of muscle based on its function. This muscle increases the angle of a joint. Contraction of this muscle returns the parts from flexor to normal position, e.g. triceps.

Multiple choice

In case of skeletal muscle, which of the following represents its chemical composition?

There can be three types of muscles based on the structure of their fibres : 1) Striated/skeletal muscle 2) Smooth muscle 3) Cardiac muscle

  1. Water 20%, protein 20%, minerals and organic compounds 60%

  2. Water 75%, protein 20%, minerals and organic compounds 5%

  3. Water 10%, protein 20%, minerals and organic compounds 70%

  4. Water 30%, protein 10%, minerals and organic compounds 60%

  5. Water 20%, protein 30%, minerals and organic compounds 50%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct composition is water 75%, protein 20%, minerals and organic compounds 5%. Minerals comprise of chiefly K+, Mg++, P+++, Na+ and Ca++. Organic compounds are present in form of glycogen, lipids, steroids and non-protein nitrogenous compounds.