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Authoritative PPT Summary
"Skin and Sweat Secretion" PPT
Part One: Situation Import
The skin is exposed to the outside all year round and comes into contact with many bacteria, so why doesn’t it rot and deteriorate? Some people’s skin is whiter than snow, while others’ skin is as black as charcoal. Why are the skin colors of the human body different? What causes “acne”? Why do people sweat?
learning target
1. Name the structural components of the skin and understand the excretory function of the skin.
2. Through discussion and communication, cultivate the ability to analyze and solve problems, and practice oral expression skills.
Skin and sweat secretion PPT, part 2 content: course exploration
Explore theme one
skin structure
epidermis
Cuticle: protects and prevents excessive loss of water in the body
Germinal layer: divides to produce new cells
Dermis: Mainly composed of dense connective tissue, containing a large number of elastic fibers and collagen fibers, and rich in blood vessels and sensory nerve endings
appendages
hair
sebaceous glands
sweat glands
Finger (toe) nails
independent inquiry
1. Why doesn’t shedding of dandruff make the skin thinner?
2. Why is the skin moist, elastic and tough, and why can animal skin be used to make "skin jelly"?
3.Does hair grow from the roots or tips?
4. If you accidentally hurt your skin and experience pain and bleeding, what is the depth of the wound?
5. Which structural level of the human body does human skin belong to? Why? What tissues are the epidermis and dermis mainly composed of?
Explore theme two
Formation and secretion of sweat
1. Sweat comes from blood
When the ambient temperature is high, the cells in the sweat gland secretion department absorb water, inorganic salts, urea, etc. from the surrounding capillaries to form sweat.
2. Sweat is discharged from the body through the sweat gland ducts.
3. When sweat is discharged, it can take away part of the body's heat.
Please speculate on the function of sweat glands: regulating body temperature and expelling waste products
Skin and sweat secretion PPT, Part 3: Thoughts and discussions
Is the skin an organ?
Skin is the largest organ in the human body.
What happened to the skin test? Why does it hurt?
A skin test is a test between the epidermis and the dermis. The dermis is rich in sensory nerve endings.
Please judge the function of the skin: feeling external stimulation.
Skin and sweat secretion PPT, part 4: training to meet standards
1. The skin is the largest organ of the human body and has the function of excreting waste. The structure in the skin that can directly discharge waste is ( )
A. Hair B. Cuticle
C.Sebaceous glands D.Sweat glands
2. Someone accidentally cut his finger while working, and a lot of it leaked out.
Blood, at least which layer of the skin was damaged ( )
A.Germinative layer B.Stratum corneum
C. Dermis D. Sweat glands
3. Xiao Ming was sweating profusely during the 1,000-meter long-distance running test. At this time, Xiao Ming ( )
A. Skin blood vessels dilate and heat dissipation increases
B. Skin blood vessels dilate and reduce heat dissipation
C. Skin blood vessels constrict and heat dissipation increases
D. Skin blood vessels constrict and reduce heat dissipation
4. When the human body sweats a lot due to strenuous exercise, lick the skin with the tip of your tongue
The skin will feel salty because ( )
A. Sweat contains water B. Sweat contains urea
C. Sweat contains uric acid D. Sweat contains inorganic salts
Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, skin and sweat secretion PPT download, .PPT format;
For more information about the PPT courseware "Discharge of Human Metabolic Wastes from the Skin and Sweat Secretion", please click the Discharge of Human Metabolic Wastes ppt Skin and Sweat Secretion ppt tag.
"Skin and Sweat Secretion" PPT courseware download:
Download the first part of the PPT courseware "Skin and Sweat Secretion": Introduction to the new lesson Skin is exposed to the outside all year round and exposed to many bacteria, so why doesn't it rot and deteriorate? Some people's skin is whiter than snow, and some people's skin is as black as charcoal. Why are the skin colors of the human body different? What is acne...
"Skin and Sweat Secretion" PPT download:
"Skin and Sweat Secretion" PPT download part one content: Course knowledge points Knowledge point 1 Epidermis and dermis constitute the skin 1. Observe the structure of the skin 2. The structure and function of the skin 3. Appendages of the skin hair, sweat glands, sebaceous glands, fingers ( Toes) nails, etc. 【example】..
"Skin and Sweat Secretion" PPT courseware:
"Skin and Sweat Secretion" PPT courseware Part 1: The structure of the skin Epidermis Cuticle Protection Germinal layer Regeneration The dermis is composed of dense connective tissue, containing a large number of elastic fibers and collagen fibers, as well as abundant blood vessels and sensory nerve endings. Skin..