"Body Defense" PPT

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"Body Defense" PPT

Part One: Introduction of New Course

Although our bodies are constantly threatened by microorganisms in the environment, we are not necessarily immune to infectious diseases. Why?

(1) The skin acts as a barrier to prevent pathogens from entering the human body.

(2) Skin and respiratory secretions have bactericidal effect

(3) The cilia on the respiratory tract mucosa swing to remove foreign matter and germs

(4) Lysozyme in tears and gastric acid in gastric juice can kill germs

Body Defense PPT, Part 2: The Human Body’s First Line of Defense

Composition: Skin

mucous membrane of stomach wall

cilia on respiratory mucosa

Function: Block or kill pathogens and prevent them from invading

The human body’s second line of defense

Composition: phagocytes

Function: Dissolve, engulf and destroy pathogens

Body defense PPT, part 3 content: thinking:

1. For some infectious diseases, once you have it once, you will not get it a second time. What is the reason for this?

2. Why do transplanted organs suffer rejection?

1. Both humoral and cellular immunity have memory functions.

2. In human organ transplantation, the transplanted organ is equivalent to a macromolecular foreign body (like a pathogen) that invades the human body for the immune function of the human body, and must be removed in every possible way. (Rejection reaction is equivalent to removing parasites and foreign bodies from the human body, and T lymphocytes play an immune role)

Body defense PPT, part 4: in-class exercises

1. Which of the following immune functions does not involve lymphocytes ( )

A. Cellular immunity B. non-specific immunity

C. Humoral immunity D. specific immunity

2. Human immunity has three lines of defense. Among the three lines of defense, non-specific immunity is ()

A. Only the first line of defense B. Only the 2nd line of defense

C. 1 and 2 two lines of defense D. 1 and 3 two lines of defense

3. Decide whether the following statements are true or false.

(1) The barrier function of human skin is non-specific immunity.

(2) Specific immunity can only work against specific pathogens.

(3) Antibodies are produced by antigens.

(4) Both B lymphocytes and T lymphocytes have the ability of immune memory.

(5) Antibodies are a type of protein.

(6) The role of T lymphocytes is to produce antibodies and complete the immune response

Keywords: Zhejiang Education Edition ninth grade science PPT courseware for the second volume free download, body defense PPT download, .PPT format;

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"Body Defense" PPT courseware:

The first part of the "Body Defense" PPT courseware content: The human body's methods of resistance to microorganisms: One is to prevent pathogens from invading the body; the other is to resist pathogens that have invaded the body. Anti-infectious immunity. The resistance that the human body has to infectious diseases is called anti-infectious immunity and anti-infectious immunity. immunity..

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Update Time: 2024-11-21

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 2 industry PPT template

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