Tag: muscles and their structure

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Multiple choice zoology skeleton - movement and locomotion types of muscles muscles muscles and their structure

Gastrocnemius muscles are found in

  1. Fore arm

  2. Chest

  3. Thigh

  4. Shank
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The two major types of muscles that make up the calf (back portion of the lower leg) are gastrocnemius and soleus muscle.
  • Along with the soleus muscle, the gastrocnemius forms half of the calf muscle. Its function is plantar flexing the foot at the ankle joint and flexing the leg at the knee joint.
  • Hence gastrocnemius muscles are found in shank(a person's leg, especially the part from the knee to the ankle).
  • So, the correct answer is 'Shank'.
Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

Which of the following is multinucleated?

  1. Nervous tissue

  2. Striated muscle

  3. Non-striated muscle

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

Multinucleate cells are those cells which have more than one nucleus per cell. Skeletal muscles or striated muscles are multinucleated cells. However, smooth muscles or non-striated muscles and cardiac muscles are mononucleated.  
Thus, the correct answer is 'Striated muscle.'

Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

On stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from

  1. Blood

  2. Lymph

  3. Bone

  4. Sarcoplasmic reticulum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A neural signal reaching this junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions into the sarcoplasm from the sarcoplasmic reticulum.
  • Active sites for myosin are present on actin which are masked by troponin-C in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin i.e Troponin-C on actin(thin) filaments and thereby remove the masking of active sites for myosin.
  • Hence on stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from sarcoplasmic reticulum.
  • So, the correct answer is 'Sacroplasmic reticulum'.
Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

Read the following statements carefully and select the correct ones. 


(i) Cardiac fibres are branched with one or more nuclei.
(ii) Smooth muscles are unbranched and cylindrical. 
(iii) Skeletal muscles can be branched or unbranched.
(iv) Smooth muscles are non-striated.

  1. Only (iv)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. Only (iii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Smooth muscles are indeed non-striated, while the other statements contain inaccuracies (e.g., cardiac fibers are branched but typically have a single nucleus, and skeletal muscles are always striated).

Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

The cytoplasm in the muscle fibre is called as

  1. Sarcoplasm

  2. Sarcolemma

  3. Neuroplasm

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

The cytoplasm in the muscle fibre is called as sarcoplasm. Sarcolemma is the sheath or cell membrane present around the striated muscle fibre. The cytoplasm in the nerve cells is called as neuroplasm. The cytoplasm in the nucleus of the cell is called as necleoplasm. 

Thus, the correct answer is 'Sarcoplasm.'

Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

All or none law is not applicable for?

  1. Single skeletal muscle fibre

  2. Single smooth muscle fibre

  3. Whole skeletal muscle

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

The all or none law states that the strength of the stimuli will not decide the reaction of the muscle fibre. f the stimulus is more than a certain threshold they will fire.  Either there will be a full response or there will be no response at all.

As we know that the stimulus works by stimulating the action potential in the fivers. The action potential is always full and thus the response will be there if the threshold is crossed.
We now that the skeletal muscle are the ones that are in control of the conscious mind and the stimuli can affect them so this is applicable for the voluntary muscles.

So, the correct option is 'Single skeletal muscle fibre'

Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

Striated muscles are found in

  1. Gall bladder

  2. Wall of bronchi

  3. Leg muscles

  4. Lungs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Striated muscle plays an integral role in the formation of the structural framework of the body. It is the only muscle tissue under the direct conscious control of the cerebral cortex of the brain and hence is the voluntary muscle. All conscious movements of the body, including movement of limbs like the movement of arm, legs, facial expressions, eye movements, and swallowing are the products of the skeletal muscle tissue.
So, the correct answer is option C.
Multiple choice zoology movement and locomotion in man structure of skeletal muscle muscles and their structure skeletal muscles

Find out the correct sequence of muscle structures/components present one within the other 

  1. Muscle fibre $\longrightarrow $ Myofilament $\longrightarrow $ Muscle bundle $\longrightarrow $ Myofibril
  2. Muscle bundle $\longrightarrow $ Muscle fibre$\longrightarrow $ Myofibril $\longrightarrow $ Myofilament
  3. Muscle bundle $\longrightarrow $ Muscle fibre $\longrightarrow $ Myofilament $\longrightarrow $ Myofibril
  4. Muscle fibre $\longrightarrow $ Muscle bundle $\longrightarrow $ Myofilament $\longrightarrow $ Myofibril
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Skeletal muscle is organized hierarchically from largest to smallest: a muscle is made of muscle bundles (fascicles), which contain muscle fibres (cells), which are packed with myofibrils, which in turn consist of myofilaments.