During muscle contraction in humans, the size of A-band remains the same, the size of \(\mathrm{H}\) zone becomes smaller and size of I-band decreases.
AIPMT - 2013
BIOXI20: LOCOMOTION AND MOVEMENT
339996
Assertion : Body parts move when body muscles are arranged in antagonistic pairs. Reason : Muscle moves the body part in one direction by its contraction and another muscle moves that part in opposite direction by its contraction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
Antagonistic muscles act in opposition to other muscle if one undergoes contraction, other undergoes relaxation. Example: Flexor and extensor muscles.
BIOXI20: LOCOMOTION AND MOVEMENT
339997
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the
1 Motor unit
2 Motor end plate
3 Neuromuscular junction (NMJ)
4 Both (2) and (3)
Explanation:
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the motor end plate or neuromuscular junction (NMJ).
BIOXI20: LOCOMOTION AND MOVEMENT
339998
The diagram shows the length-tension relationship for a single sarcomere Why is the tension development maximal between points \(\mathrm{B}\) and \(\mathrm{C}\) ?
1 The length of A-band decreases to minimum
2 The length of I-band increases to maximum
3 There is optimal overlap between the actin and myosin filaments
4 The length of actin and myosin filaments decreases to minimum
Explanation:
Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Neither the thick filaments nor the thin filaments shorten. During contraction, I-bands get reduced while A-bands retain their length.
During muscle contraction in humans, the size of A-band remains the same, the size of \(\mathrm{H}\) zone becomes smaller and size of I-band decreases.
AIPMT - 2013
BIOXI20: LOCOMOTION AND MOVEMENT
339996
Assertion : Body parts move when body muscles are arranged in antagonistic pairs. Reason : Muscle moves the body part in one direction by its contraction and another muscle moves that part in opposite direction by its contraction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
Antagonistic muscles act in opposition to other muscle if one undergoes contraction, other undergoes relaxation. Example: Flexor and extensor muscles.
BIOXI20: LOCOMOTION AND MOVEMENT
339997
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the
1 Motor unit
2 Motor end plate
3 Neuromuscular junction (NMJ)
4 Both (2) and (3)
Explanation:
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the motor end plate or neuromuscular junction (NMJ).
BIOXI20: LOCOMOTION AND MOVEMENT
339998
The diagram shows the length-tension relationship for a single sarcomere Why is the tension development maximal between points \(\mathrm{B}\) and \(\mathrm{C}\) ?
1 The length of A-band decreases to minimum
2 The length of I-band increases to maximum
3 There is optimal overlap between the actin and myosin filaments
4 The length of actin and myosin filaments decreases to minimum
Explanation:
Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Neither the thick filaments nor the thin filaments shorten. During contraction, I-bands get reduced while A-bands retain their length.
During muscle contraction in humans, the size of A-band remains the same, the size of \(\mathrm{H}\) zone becomes smaller and size of I-band decreases.
AIPMT - 2013
BIOXI20: LOCOMOTION AND MOVEMENT
339996
Assertion : Body parts move when body muscles are arranged in antagonistic pairs. Reason : Muscle moves the body part in one direction by its contraction and another muscle moves that part in opposite direction by its contraction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
Antagonistic muscles act in opposition to other muscle if one undergoes contraction, other undergoes relaxation. Example: Flexor and extensor muscles.
BIOXI20: LOCOMOTION AND MOVEMENT
339997
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the
1 Motor unit
2 Motor end plate
3 Neuromuscular junction (NMJ)
4 Both (2) and (3)
Explanation:
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the motor end plate or neuromuscular junction (NMJ).
BIOXI20: LOCOMOTION AND MOVEMENT
339998
The diagram shows the length-tension relationship for a single sarcomere Why is the tension development maximal between points \(\mathrm{B}\) and \(\mathrm{C}\) ?
1 The length of A-band decreases to minimum
2 The length of I-band increases to maximum
3 There is optimal overlap between the actin and myosin filaments
4 The length of actin and myosin filaments decreases to minimum
Explanation:
Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Neither the thick filaments nor the thin filaments shorten. During contraction, I-bands get reduced while A-bands retain their length.
During muscle contraction in humans, the size of A-band remains the same, the size of \(\mathrm{H}\) zone becomes smaller and size of I-band decreases.
AIPMT - 2013
BIOXI20: LOCOMOTION AND MOVEMENT
339996
Assertion : Body parts move when body muscles are arranged in antagonistic pairs. Reason : Muscle moves the body part in one direction by its contraction and another muscle moves that part in opposite direction by its contraction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect.
Explanation:
Antagonistic muscles act in opposition to other muscle if one undergoes contraction, other undergoes relaxation. Example: Flexor and extensor muscles.
BIOXI20: LOCOMOTION AND MOVEMENT
339997
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the
1 Motor unit
2 Motor end plate
3 Neuromuscular junction (NMJ)
4 Both (2) and (3)
Explanation:
The junction between a motor neuron and the sarcolemma of the muscle fibre is called the motor end plate or neuromuscular junction (NMJ).
BIOXI20: LOCOMOTION AND MOVEMENT
339998
The diagram shows the length-tension relationship for a single sarcomere Why is the tension development maximal between points \(\mathrm{B}\) and \(\mathrm{C}\) ?
1 The length of A-band decreases to minimum
2 The length of I-band increases to maximum
3 There is optimal overlap between the actin and myosin filaments
4 The length of actin and myosin filaments decreases to minimum
Explanation:
Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Neither the thick filaments nor the thin filaments shorten. During contraction, I-bands get reduced while A-bands retain their length.
