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"Linematids and Annelida" PPT courseware on the main groups of animals
Observe and think
1. Body shape and color of roundworms
Cylindrical, slender at both ends; milky white, reddish.
2. Morphological differences between male and female roundworms
Female: thick and long body, pointed and straight tail;
Male: Small body, curled tail.
Characteristics of roundworms suitable for parasitic life:
There is a cuticle on the body surface, which plays a protective role.
The digestive tube has a simple structure (feeds on semi-digested human food).
Have developed reproductive organs.
Read the 8 pages of the textbook on the relationship between roundworm animals and humans and answer the following questions
symptom:
Abdominal pain, insomnia, irritability, teeth grinding, cramps, headache, biliary ascariasis, appendicitis, peritonitis
Ascariasis prevention:
First: Pay attention to personal hygiene: do not drink unclean water, wash raw vegetables and fruits
Wash your hands before eating and after using the toilet
Second: Strictly manage feces: do not defecate in the open, and the feces must be treated and used as fertilizer.
1. Pinworm
Parasite site: large intestine
Route of transmission: oral infection, retrograde infection
Adult worms often crawl to the anus at night to lay eggs, causing anal itching. After the eggs hatch in the anus, the larvae can invade the large intestine through the anus and cause retrograde infection.
2. Hookworm
Parasite site: small intestine
Symptoms: Severe anemia, digestive disorders, heterophilia
3. Filaria
Transmission vector: mosquito
Parasite site: lymphatic system
Symptoms: chyluria, elephantiasis
annelids
Annelida - the beginning of higher invertebrates
Observe and think
1. Is the body of an earthworm segmented?
2. What does it feel like if you touch the belly of an earthworm with wet fingers?
3. Use a magnifying glass to observe the ventral surface of an earthworm. What can you see?
4. Observe the movement of earthworms and think about the reason why earthworms can move?
5. Is there mucus on the body surface of earthworms? Think about what it does?
1. What is the living environment of earthworms?
moist soil
2. What are the living habits of earthworms?
They live in caves in the soil during the day and emerge from the ground at night to feed on fallen leaves.
3. Think about it: What is the food of earthworms?
Movement of earthworms
The circular muscles and longitudinal muscles in the earthworm body wall alternately relax and contract, and the setae on the body surface cooperate
The rear setae are nailed into the soil and the rear part cannot move.
Circular muscles contract, longitudinal muscles relax, body lengthens
The front bristles are driven into the soil and the front cannot move.
The bristles on the back are raised and the back can move.
Circular muscles relax, longitudinal muscles contract, and the body shortens forward.
(3) Classification of Annelida
There are currently more than 17,000 known species of annelids, divided into three classes:
1. Polychaeta:
There are more than 3,300 species, all of which are seafood, and most of them can be used as fish bait.
Characteristics: Use wart legs as locomotion organs, no reproductive zone, and are dioecious.
Such as: Nereis
There are about 10,000 species, divided into three categories
Wandering orders: Nereis worms, Nereis squamata
Hermit order: Coilworms, sandworms
Order Stomata: Stomata
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"Linematids and Annelida" Main Groups of Animals PPT Courseware 8:
"Nematodes and Annelida" Main Groups of Animals PPT Courseware 8 Nematodes Please analyze the structural characteristics of roundworms. What are the characteristics suitable for parasitism in the human body? The body is cylindrical, with a mouth and anus; there is a cuticle on the body surface for protection, and the structure of the digestive tract...
"Linematids and Annelida" Main Groups of Animals PPT Courseware 7:
"Nematodes and Annelida" Main groups of animals PPT courseware 7 Independent learning, cooperative exploration Reading and thinking: ⑴ What are the differences in the morphology of male and female roundworms? ⑵Where do roundworms infest? What are the feeding habits of roundworms? (3) What is the body structure of roundworms? What are the benefits of roundworms...
"Linematids and Annelida" Main Groups of Animals PPT Courseware 6:
"Nematodes and Annelida" Main Groups of Animals PPT Courseware 6 Exploring Observation 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. Observe the internal structure of roundworms. What structural characteristics do you think of roundworms?