How does earthworm change its shape?
Body shape changes are what’s behind earthworm wriggling. In earthworms, each segment can move independently, so that alternating contractions between the two different sets of muscles in many different segments create shape changes all along the body.
What is the function of the segments in an earthworm?
The earthworm uses segments to either contract or relax independently to cause the body to lengthen in one area or contract in other areas. Segmentation helps the worm to be flexible and strong in its movement. If each segment moved together without being independent, the earthworm would be stationary.
How do earthworms grow and develop?
After earthworms mate, their fertilised eggs are held in a protective cocoon. The baby worms (hatchlings) emerge and burrow into the soil, where they grow into juvenile then mature worms.
What happens to the shape of the segment of an earthworm When the longitudinal muscles contract?
During an earthworm’s movement, circular and longitudinal muscles take turns contracting. To move forward, circular muscles in the front of the body contract. Contracting those muscles makes the segments thinner and longer, allowing the worm to reach forward.
How many hearts does an earthworm have?
Heartbeats: Worms don’t have just one heart. They have FIVE! But their hearts and circulatory system aren’t as complicated as ours — maybe because their blood doesn’t have to go to so many body parts.
What animal has no stomach?
platypus
How do platypus eat without a stomach?
A platypus doesn’t really have a stomach. Instead of a separate pouch where food collects, the platypus’ esophagus is directly connected to its intestine.
Who has the biggest stomach?
Largest stomach: Blue whale.
Which is the longest part of the body?
The longest bone in the human body is the femur. The largest artery is the aorta and the largest vein is the inferior vena cava. The largest internal organ (by mass) is the liver, with an average of 1.6 kilograms (3.5 pounds). The largest external organ, which is also the largest organ in general, is the skin.
What is the biggest pregnant?
It’s completely natural to gain weight when you’re pregnant. But Lara Carpenter-Beck, 29, from Bristol, gained an incredible 6st 9lb while carrying her first baby Savannah. Lara’s weight gain resulted in her baby bump growing to 55 inches – quite something when you’re 5ft 7in.