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CHAPTER- 20 LOCOMOTION AND MOVEMENT
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CHAPTER- 20 LOCOMOTION AND MOVEMENT
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CBSE Quick Revision Notes (Class-11 Biology)CHAPTER- 20 LOCOMOTION AND MOVEMENT
Locomotion is the voluntary movement
of an individual from one place to
another. Walking, running, climbing,
swimming are the example of
locomotory motion. All locomotion are
movement but all movements are not
locomotion.
• Macrophages and leucocytes in blood exhibit amoeboid movements. Coordinated movement
in cilia in trachea to remove dusts particles and passage of ova through fallopian tube is
example of Cilliary movements.
• Movement of limbs, jaw, tongue and needs muscular movement. Contractile property of
muscles is used in movement in higher organism including human beings.
Muscles are specialized tissues of mesodermal origin. They have property like excitability,
contractility, extensibility and elasticity.
Muscle
Skeletal Muslces Visceral Muscles Cardiac Muscles
Skeletal Muscles Visceral Muscles Cardiac
Associated with skeletal Form inner wall of internal Muscles of heart, having
system, alternate light visceral organs, non- branching pattern,
and dark bands striated, involuntary alternate light and dark
(striated), voluntary and muscle, assists in bands, involuntary in
locomotory and change movement of food action.
in body posture function. through digestive tract
and gametes.
Skeletal Muscles is made up of muscles
bundles (fascicles), held together by
collagenous connective tissue called fascia.
Each muscle bundle contains a number of
muscle fibres. Each muscle fibres is lined by
plasma membrane sarcolemma inclosing
sarcoplasm. Partially arranged myofibrils are
present in muscles bundle having alternate
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