Tag: skeletal muscles

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Questions Related to skeletal muscles

Multiple choice biology locomotion and movements structure of muscle skeletal muscles coordination

Match column I with column, option from. the codes given below:

Column I Column II
A. Structural and functional -unit of a myofibril (i) H-zone
B. Protein of thin filament (ii) Myosin
C. Protein of thick filament (iii) Sarcomere
D. The central part of thick filament not overlapped by thin filament (iv) Actin

  1. A-(i), B-(ii), C,(iii), D-(iv)

  2. A-(i), B-(iii), C-(ii), D-(iv)

  3. A-(i), B-(iv), C-(iii), D-(ii)

  4. A-(iii),B-(iv), C-(ii), D-(i)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 A. Structural and functional -unit of a myofibril - (iii) Sarcomere

B. Protein of thin filament - (iv) Actin

C. Protein of thick filament - (ii) Myosin

D. The central part of thick filament not overlapped by thin filament - (i) H-zone

So, the correct answer is 'A-(iii),B-(iv), C-(ii), D-(i)'.
Multiple choice biology locomotion and movements structure of muscle skeletal muscles coordination

The functional unit of contractile system in a striated muscle is 

  1. sarcomere

  2. Z-band

  3. cross bridges

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

The sarcomeres are fibrous protein filaments that slide past one another when the muscle contracts or relaxes. It is basically the region between two Z-bands. It is also the functional unit of the contractile system in a striated muscle.

So, the correct answer is 'sarcomere'.

Multiple choice biology locomotion and movements structure of muscle skeletal muscles coordination

Read the given statements and select the correct option.
Statement 1 : A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin.
Statement 2 : Myosin and actin together form a contractile apparatus. 

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Both the statements given in the question are correct as a primary myofilament is composed of a bundle of rod-like molecules of a protein myosin and myosin and actin together form a contractile apparatus.
So, the correct answer is '
Both statements 1 and 2 are correct.'
Multiple choice biology locomotion and movements structure of muscle skeletal muscles coordination

Myosin filaments are thick and are made up of small units called meromyosin. Each meromyosin globular head with short arm called ____________.

  1. Heavy meromyosin

  2. Light meromycin

  3. Both a and b

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Myosin molecules consist of heavy meromyosin (the globular head with short arm) and light meromyosin (the rod-like tail). The heavy meromyosin head contains the ATPase activity and actin-binding site crucial for muscle contraction. Option B incorrectly spells meromyosin as meromycin (an antibiotic compound), making Option A the correct choice.

Multiple choice biology locomotion and movements structure of muscle skeletal muscles coordination

Which of the.following statements are correct regarding muscle proteins ?
 (i) Actin is a thin filament and is Frock up of two F-actirs.
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin. 
(iii)  Myosin is a thick flament which is also a polymerised protein. 
(iv) The globular head of meromyosin consists of light merornyosin (LMM).

  1. (i), (ii) and (iii)

  2. (i), (ii) and (iv)

  3. (i) and (iii)

  4. (ii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Actin is the thin filament in the sarcomere, comprising F-actin, tropomyosin and troponin protein, troponin is attached to tropomyosin, while myosin is a thick filament.

So, the correct option is '(i), (ii) and (iii)'.

Multiple choice biology neural control and coordination structure of muscle skeletal muscles locomotion and movements

Which of the following is called as the response?

  1. Drawing out the hand

  2. Pricking with the pin

  3. Pin in the box

  4. Hand in the pocket
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A stimulus is something that causes a physiological response. The ability of an organism or organ to respond to external stimuli is called sensitivity. So, in the above example, the response to stimulus is drawing out hand and not pricking with pin, only pin or hand.

Therefore, the correct answer is option A.

Multiple choice biology neural control and coordination structure of muscle skeletal muscles locomotion and movements

When you are pricked with a pin, you will draw out your hand very fast. The stimulus is 

  1. Drawing out hand

  2. Pricking with a pin

  3. Pin

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

A stimulus is something that causes a physiological response. The ability of an organism or organ to respond to external stimuli is called sensitivity. So, in the above example, the stimulus is pricking with pin and not drawing out hand, only pin or hand. 

Therefore, the correct answer is option B.

Multiple choice biology neural control and coordination structure of muscle skeletal muscles locomotion and movements

Internal stimulus comes from

  1. Inside an organism

  2. Outside an organism

  3. Skin

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • In physiology, a stimulus is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity. 
  • When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex. Hence, Internal stimulus comes from
Inside an organism.
 So, the correct answer is 'Inside an organism'.