Support, Movement and Growth in Animals (8)

The movement of earthworm with hydrostatic skeleton (3)

When the circular muscles contract, the longitudinal muscles relax causing the earthworm body to become thin and long

The movement of earthworm with hydrostatic skeleton (4)

When the longitudinal muscles contract and circular muscles relax, the earthworm body will become thicker and shorter

The movement of earthworm with hydrostatic skeleton (5)

The antagonistic (opposing) action of the circular muscles and longitudinal muscles exerts a hydrostatic pressure on the fluid in the earthworm body

The movement of earthworm with hydrostatic skeleton (6)

When the earthworm body becomes thinner and longer, the hydrostatic pressure transfers the fluid in its body to the rear end of the body

The movement of earthworm with hydrostatic skeleton (7)

The body fluid will be transferred to the part shortened by the hydrostatic pressure causing the rear of the earthworm to be stretched to the front

Hydrostatic skeleton in the earthworm

The arrangement of the circular muscles and longitudinal muscles in the eartworm

The way the earthworm moves

The way the earthworm moves (1)

The earthworm moves with the aid of the contraction and relaxation of the circular and longitudinal muscles that take place antagonistically from the anterior part to the posterior part

The way the earthworm moves (2)

When the longitudinal muscles contract and the circular muscles relax, the segments on the body of the earthworm will shorten and thicken

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Question

Support, Movement and Growth in Animals (8)

Support, Movement and Growth in Animals (8)