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"Birds" Main groups of animals PPT courseware 5
Think about it, discuss it
When crossing a river, did you ever wish you could fly across it?
But ultimately man cannot fly like a bird. Why is this?
By studying this section, you will know:
1. What are the main characteristics of birds?
2. What is the relationship between birds and human life?
1. Various birds
⑴Tell me about the birds you know. Why are they called birds?
Such as: chicken, duck, goose, ostrich, penguin, crow, sparrow...
⑵ Distinguish between birds in different environments
Explore: The characteristics of birds that make them suitable for flight
Ask the question: What are the characteristics of a bird’s body that make it suitable for flight?
What does the bird look like? streamline
How does it help birds fly? Reduce drag during flight
Exploration 2: Observation of Internal Structure
Which muscles are the most developed in domestic pigeons?
think:
What is the relationship between the muscle characteristics of domestic pigeons and the flight movement of the wings?
Developed chest muscles can flap the wings to facilitate flight.
Observation: Domestic Pigeon Skeleton
What are the characteristics of the sternum of domestic pigeons? ( ), consider it in connection with the muscles attached to this bone (such as the chest muscles), what is the role of this feature?
What does this structure and characteristics have to do with flight?
The airbag assists the lungs in breathing, improves the efficiency of gas exchange, and meets the need for oxygen during flight. At the same time, the air bag can reduce the body's specific gravity; it is helpful to reduce friction between internal organs and dissipate body heat.
get conclusion:
1. Body shape: streamlined, which can reduce resistance during flight
2. Body surface: covered with feathers, forelimbs: transformed into wings that can fly
3. Muscles: well-developed chest muscles
4. Bones: light, thin, with keel protrusions, long bones hollow
5. Digestive system: well-developed, large food intake, rapid digestion, absorption and excretion of feces
6. Circulation system: perfect structure, strong function of transporting nutrients and oxygen
7. Respiratory system: There are unique air bags that can assist breathing
Standard feedback
1. The bones in the chest of domestic pigeons are very prominent, and their function is ( )
A. Reduce air resistance B. Maintain body balance
C. Lose weight D. Attach well-developed chest muscles
2. Which of the following does not belong to the function of bird air sacs ( )
A. Carry out gas exchange B. Heat dissipation and cooling
C. Reduce the specific gravity of the body D. Reduce the friction between internal organs during flight
3. The main difference between birds and other types of animals is ( )
a. There are feathers on the body b. The forelimbs turn into wings c. Breathe with lungs and use air bags to assist breathing
d. Four chambers of the heart e. Constant body temperature
A. a b c B. b d e C. a c e D. c d e
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For more information about the PPT courseware "Main Groups of Birds and Animals", please click the "Main Groups of Birds ppt Animals" ppt tab.
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