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 molecules presence is required for the myosin to get sticked to actin?

  1. ATP

  2. ADP

  3. AMP

  4. GTP

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

Adenosine diphosphate, abbreviated ADP, is an important organic compound in metabolism and is essential to the flow of energy in living cells. A molecule of ADP consists of three important structural components: a sugar backbone,  which is attached to a molecule of adenosine and two phosphate groups located around its ring structure.

Multiple choice

Muscular strength relates to your muscles' _____.

  1. ability to flex

  2. force in a single repetition

  3. measurement

  4. ability to perform without fatigue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Muscular strength is the amount of force a muscle can produce in a single maximal effort, as opposed to muscular endurance.

Multiple choice respiration and excretion in animals human respiratory system evs respiration in human beings respiratory organs in humans respiration in humans

Diaphragm is 

  1. Dome shaped muscle

  2. Oblique muscle

  3. Round muscle

  4. Elongated muscle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The diaphragm is a part of the abdominopelvic cavity.
  •  It is located below the thoracic cavity and above the pelvic cavity.
  •  Its dome-shaped roof is the thoracic diaphragm, a thin sheet of muscle under the lungs, and its floor is the pelvic inlet, opening into the pelvis. Hence, the diaphragm is a dome-shaped muscle.
So, the correct answer is 'dome-shaped muscle'.

Multiple choice

The strongest muscle in the body is...

  1. Arm

  2. Leg

  3. Eye

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

The tongue is often cited as the strongest muscle in the human body based on its ability to exert force relative to its size and its constant use throughout the day.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

The muscle fatigue occurs due to the accumulation of

  1. lactic acid

  2. glycogen

  3. creatine phosphate

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Long-term muscle use requires the delivery of oxygen and glucose to the muscle fibre to allow aerobic respiration to occur, producing the ATP required for muscle contraction. If the respiratory or circulatory system cannot keep up with demand, then energy will be generated by the much less efficient anaerobic respiration.
In aerobic respiration, pyruvate produced by glycolysis is converted into additional ATP molecules in the mitochondria via the Krebs Cycle. With insufficient oxygen, pyruvate cannot enter the Krebs cycle and instead accumulates in the muscle fibre. Pyruvate is continually processed into lactic acid. With pyruvate accumulation, lactic acid production is also increased. This lactic acid accumulation in the muscle tissue reduces the pH, making it more acidic and producing the stinging feeling in muscles and induces fatigue.
So, the correct option is 'lactic acid'.
Multiple choice zoology structural organization in living organisms specialized cells in animals tissues and types of tissues levels of organisation in animals

The voluntary muscles are known as

  1. Striated muscles

  2. Cardiac muscles

  3. Unstriated muscles

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Striated muscles or skeletal muscles are the most abundant type of muscle fibers found attached to the bones. They are multinucleated and voluntary in nature. They help in the movement of different parts of the body.
So, the correct answer is 'Striated muscles'.
Multiple choice zoology structural organization in living organisms specialized cells in animals tissues and types of tissues levels of organisation in animals

Which of the following characteristics can be related to cardiac muscles?

  1. They are striated.

  2. They are involuntary muscles.

  3. They are less prone to fatigue.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The cardiac muscles are present on the wall of the heart. These muscles are striated muscles but involuntary in nature. They are under the control of the autonomic nervous system. Due to the presence of large number of mitochondria, they have the continuous supply of oxygen and hence these muscles are less prone to fatigue.
So the correct answer is 'All of the above'.