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 ${C a}^{2 +}$ source on sarcoplasmic reticulum and extracellular fluid.

50% studentsanswered this correctly

Important Questions on Locomotion and Movement

MEDIUM

Biology>Human Physiology>Locomotion and Movement>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

EASY

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Myoglobin helps in the transport of oxygen in _______.

EASY

Biology>Human Physiology>Locomotion and Movement>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

EASY

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

EASY

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Regulatory proteins in a myofibril are

MEDIUM

Biology>Human Physiology>Locomotion and Movement>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.

HARD

Biology>Human Physiology>Locomotion and Movement>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.

HARD

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Which type of tissue is correctly paired with its location?

EASY

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Identify the correct statement with reference to shortening of sarcomere

EASY

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Arrange the following in a sequence from edge to centre in a sarcomere.