Jawapan

2016-04-02T11:11:41+08:00

Ini Jawapan Diperakui

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Jawapan diperakui mengandungi maklumat yang boleh dipercayai dan diharapkan yang dijamin dipilih dengan teliti oleh sepasukan pakar. Brainly mempunyai berjuta-juta jawapan berkualiti tinggi, semuanya disederhanakan dengan teliti oleh ahli komuniti kami yang paling dipercayai, tetapi jawapan diperakui adalah terbaik di kalangan terbaik.
Earthworms - Locomotion Above: an earthworm undergoing locomotion and moving toward the top of the page. Each frame represents a one second time interval from left to right. Before we can analyse this pattern of locomotion we need to understand how contraction of the circular and longitudinal muscle layers of the body wall affect the shape of the worm. Circular muscle fibres run in circles concentric to the circumference of the worm whilst longitudinal muscles run parallel to the long axis from one end of a segment to another. These muscles operate upon the liquid-filled body cavity or coelom, which acts as a pressurisable hydrostatic skeleton. Contraction of the circular muscles makes the worm thinner, but because liquid is essentially incompressible (and so maintains a constant volume) and the increase in pressure forces the liquid outwards, stretching the worm, so the worm becomes longer and thinner. Contraction of the longitudinal fibres shortens the worm, former the coelomic liquid out to the sides and making the worm fatter.
  • Pengguna Brainly
2016-04-03T12:45:05+08:00

Ini Jawapan Diperakui

×
Jawapan diperakui mengandungi maklumat yang boleh dipercayai dan diharapkan yang dijamin dipilih dengan teliti oleh sepasukan pakar. Brainly mempunyai berjuta-juta jawapan berkualiti tinggi, semuanya disederhanakan dengan teliti oleh ahli komuniti kami yang paling dipercayai, tetapi jawapan diperakui adalah terbaik di kalangan terbaik.
Movement involves extending the body, anchoring it to a surface with setae, and contracting body muscles. When the worm begins a forwardmovement, circular muscles at the anterior end contract, extending the head forward.