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The immediate regeneration of ATP used up during muscle contraction is facilitated by

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Important Questions on Muscular and Skeletal System

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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans

During muscular contraction which of the following events occur?
(a) 'H' zone disappears
(b) 'A' band widens
(c) 'I' band reduces in width
(d) Myosin hydrolyzes ATP, releasing the ADP and Pi
(e) Z-lines attached to actins are pulled inwards.

Choose the correct answer from the options given below.

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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Assertion (A) : Skeletal muscle fibre is in syncytial state
Reason (R):  It is formed by fusion of cells
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Myoglobin helps in the transport of oxygen in _______.
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Statement I: T- tubule of muscle fibre and the two terminal cisternae at its sides from the triad system
Statement II: Actin is a motor protein that is able to convert chemical energy into mechanical energy
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Neurotransmitter released at the neuromuscular junction of a voluntary muscles is:
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans

Assertion (A): Skeletal muscles have very limited power of regeneration.

Reason (R): Satellite cells are present in them.

The correct option among the following is

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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Which one of the following proteins does not play a role in skeletal muscle contraction?
HARD
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Calcium important in skeletal muscle contraction because 
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Regulatory proteins in a myofibril are
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Identify the correct statement with reference to shortening of sarcomere
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Which of the following statements about muscles are correct?
(i) Muscles show three essential properties such as excitability, conductivity and contractility.
(ii) Muscular tissue is endodermal in origin except muscle of iris and ciliary body.
(iii) The cytoplasm of muscle fibre has several myofibrils.
(iv) Skeletal muscles exhibit slow and prolonged contractions.
(v) The regular arrangement of myosin and actin filaments is responsible for alternate dark and light bands of striated muscle.
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
The part of sarcomere that contains both thick and thin filaments are present in ________.
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Assertion (A): Light meromyosin and Heavy meromyosin are often called regulatory proteins.
Reason (R): The above said molecules have a role in masking and unmasking the active sites on actin.
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Choose the incorrect statement about muscle contraction from the following:
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Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Arrange the following in a sequence from edge to centre in a sarcomere.
A) M-line
B) Z-line
C) H-zone
D) I-band
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Which of the following is not a character of red muscle?
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Sliding filament theory can be best explained as:
MEDIUM
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
Read the statement given below and mark the correct answer.

Statement (A): Gap junctions are present in cardiac muscle fibres but are of little functional importance

Statement (B): Skeletal muscle depend for Ca2+ source on sarcoplasmic reticulum and extracellular fluid.
HARD
Biology>Human Anatomy and Physiology-III>Muscular and Skeletal System>Muscular System of Humans
The strongest muscle in the human is