Tag: movement and locomotion in man

Questions Related to movement and locomotion in man

Largest muscle of human body is

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Stapedium

  2. Quadriceps

  3. Gluteus maximus 

  4. Masseter

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Correct Option: C
Explanation:

The gluteus maximus is the largest muscle in the human body. These muscles help move the hips and thighs and also keep the trunk of the body in upright position. These muscles work against the gravity when we are walking up stairs. So, the correct answer is 'Gluteus maximus'.

Which of the following muscle types CNNOT be used valuntarily.

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Both striated and smooth

  2. Both cardiac and striated

  3. Both smooth and cardiac

  4. Cardiac,striated and smooth

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Correct Option: C

The two muscles which help in thermoregulaton of the scrotum moving it up or down depending on outside temperature are

biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

  1. Gastrocnemius and Flexor longus

  2. Cremaster and Danos muscle

  3. Adductor longus and Abductor flexor

  4. Flexor longus-Cremaster

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Correct Option: A

Which of these tissues is responsible for contractions that allow the movement of the body?

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Muscle

  2. Nervous

  3. Epithelial

  4. Connective

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Correct Option: A
Explanation:

Skeletal muscles are involved in contraction and relaxation. An action potential travels through the motor neuron. The motor neurons are linked to the muscle fibers at the neuromuscular junction. When this nervous signal reaches the neuromuscular junction the neurotransmitter called acetylcholine is released. This neurotransmitter binds to the receptors on the surface of the muscle fiber leading to muscular contraction. Thus the correct answer is option A.

Standing on tip toe is an example of

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Elevation

  2. Flexion

  3. Extension

  4. Retraction

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Correct Option: A
Explanation:
  • Joints are points of contact between bones, or between bones and cartilages.
  • Synovial joints are characterized by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. These joints help in locomotion and many other movements. The hinge joint is a type of synovial joint.
  • extension refers to movement in the posterior direction. For example, when standing up, the knees are extended.
  • Hence standing on tiptoe(HINGE JOINT AT ANKLE) is an example of an extension.
  • So, the correct answer is 'Elevation'.

Which of the following muscles move the lower jaw, tongue and the head backward?

biology movement and locomotion in man types of muscles muscles muscles and their structure

  1. Abductor

  2. Retractor

  3. Proctor

  4. All of the above

Show answer
Correct Option: B
Explanation:
  • A muscle that draws a body part backward is called Retractor.
  • For example, The horizontal fibers of the temporalis muscle serve to retract the mandible(lower jaw).
  • Hence retractor muscles move the lower jaw, tongue and the head backward.
  • So,the correct answer is 'Retractor'.

Which of the following is multinucleated?

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

  1. Nervous tissue

  2. Striated muscle

  3. Non-striated muscle

  4. None of these

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Correct Option: B
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.'

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

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

  1. Blood

  2. Lymph

  3. Bone

  4. Sarcoplasmic reticulum

Show answer
Correct Option: D
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'.

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.

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

  1. Only (iv)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. Only (iii)

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Correct Option: A

The cytoplasm in the muscle fibre is called as

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

  1. Sarcoplasm

  2. Sarcolemma

  3. Neuroplasm

  4. Nucleoplasm

Show answer
Correct Option: A
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.'