Locomotion and Movement

• The cells of human body exhibit amoeboid, ciliary, and muscular types of movements.

• Amoeboid movement – Example: leucocytes present in the blood
• Ciliary movement – Example: passage of ova through fallopian tube
• Muscular movement – Example: movement of limbs, jaws, and tongue

• Based on location, muscles are of three types;

• Skeletal muscles/striated muscles – Voluntary in nature
• Visceral muscles/smooth muscles – Involuntary in nature
• Cardiac muscles – Involuntary in nature

• Myofibril is one of the several contractile filaments that make up a striated muscle fibre.
• Sarcomere is a part of myofibril.
• Sarcomere composed of two contractile proteins:

• Actin – Thin filament and called I band
• Myosin – Thick filament and called A band

• Z line bisects the centre of each I band.
• The functional unit of contraction between two success…