Biology · General Awareness

Muscle Biology

798 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

Biceps Brachii and Psoas major are which type of muscles?

  1. Pennate Muscles

  2. Fusiform Muscles

  3. Parallel Muscles

  4. Convergent Muscles

  5. Circular Muscles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

These muscles are more spindle shaped, with the muscle belly being wider than the origin and insertion. Prominent examples are Biceps Brachii and Psoas major.

Multiple choice

The process of a muscle contracting is a complex process. Which of the following statements does not characterise muscle contraction in humans?

  1. A nervous impulse comes at the neuromuscular junction and from the terminal Acetylcholine is released.

  2. In the presence of high concentrations of Ca+, the Ca+ binds to Tropomyosin.

  3. The breakdown of ATP helps in the shortening ot the muscle.

  4. The Myosin leaves the Actin and the cross-bridge is broken when an ATP molecule binds to the Myosin head.

  5. The process of muscular contraction can last for as long as there is adequate ATP.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the wrong statement. In the presence of high concentrations of Ca2+, the Ca2+ binds to troponin, changing its shape and so moving tropomyosin from the active site of the actin. The myosin filaments can now attach to the actin, forming a cross-bridge.

Multiple choice

_____ muscle is used for the respiration.

  1. Pectoralis major

  2. Diaphragm

  3. Phalanges

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

The diaphragm is the primary muscle of respiration. When it contracts, it flattens, increasing the volume of the thoracic cavity and allowing air to be drawn into the lungs.

Multiple choice

Increased tone of the muscles is called ______________.

  1. Hypertonia

  2. Hyptonia

  3. Dystonia

  4. Myotonia

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hypertonia is a condition characterized by an increased muscle tone, which can cause muscles to feel stiff or tight, often resulting from damage to the central nervous system.

Multiple choice

The muscle cells have myoglobin which acts as a reservoir of oxygen.Myoglobin is an example of ________ protein.

  1. Contractile and Motile proteins

  2. Transport Proteins

  3. Defence Proteins

  4. Storage Proteins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Many proteins are stored to serve as reservoirs of amino acids and nitrogen. For instance, seeds of many plants store nutrient protein required for germination and growth of seedlings. Zeins of corn, phaseolin of peas and glutellins of wheat and rice are common storage proteins. Ferritin protein of bacteria and plant and animal cells stores iron. Myoglobin of muscle cells acts as a reservoir of oxygen.

Multiple choice

Latissimus dorsi is a/an

  1. invertor muscle

  2. abductor muscle

  3. constrictor muscle

  4. adductor muscle

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

Latissimus dorsi is an adductor muscle which brings the arms towards the body.