"Linematids and Annelida" Main Groups of Animals PPT Courseware 6

Description

"Linematids and Annelida" Main Groups of Animals PPT Courseware 6

Find out and observe

Observe the roundworm specimens to see the difference in shape and size between male and female roundworms, as well as the characteristics of the body color and surface.

Observing the internal structure of roundworms, which structural characteristics of roundworms do you think are suitable for parasitic life?

feature

1. Cylindrical or linear

Protocoelomates are bilaterally symmetrical and have a cylindrical or linear body;

With mouth and anus, complete digestive system

There is a mouth at the front end and an anus at the back end, becoming a complete digestive tube;

The structure is complete: there is a mouth and anus, and the structure is more complete;

Complete function: food and food residues are not mixed, digestion is more complete;

2. Hookworm (adult worm is small, about 1cm long, reddish, slightly C-shaped)

Harm: anemia, loss of labor force, etc.;

Parasite site: small intestine, sucking blood from the intestinal wall;

Intermediate host: none; skin contact infection;

Infectious state larvae: filarial larvae

Representative animal--Earthworm

1. Ecological habits

Terrestrial annelids. They live in the soil, stay up during the day and emerge at night, feeding on decaying organic matter and swallowing it together with the soil. It also feeds on plant stems and leaves.

Earthworms can loosen the soil, improve the soil, improve fertility, and promote agricultural production.

2. Digestive system

constitute:

Digestive tube: mouth, buccal cavity, pharynx, esophagus, crop, gizzard, stomach, intestine, cecum, anus;

Digestive glands: calcium glands, pharyngeal glands, gastric glands

leech

Leeches are commonly known as leeches, and there are about 500 species

Most are aquatic (mostly live in fresh water, a few are marine), and a few are terrestrial.

Leeches have blood-sucking habits and were used in medical treatment in the 19th century as a means of bloodletting to treat congestion in human tissue. They are still used in surgery to reattach amputated limbs today. Currently, leeches and hirudin are used as good medicines for the treatment of cardiovascular diseases.

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For more information about the PPT courseware "The Main Groups of Animals: Nematodes and Annelida", please click on the "Main Groups of Animals PPT Linear Animals and Annelida PPT" tab.

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"Linematids and Annelida" Main Groups of Animals PPT Courseware 7:

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Update Time: 2024-11-27

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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