"Skin and Sweat Secretion" PPT download

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"Skin and Sweat Secretion" PPT download

Part One: Course Knowledge Points

Knowledge point 1: Epidermis and dermis constitute skin

1. Observe the structure of the skin

2. Skin structure and function

3. Appendages of skin

Hair, sweat glands, sebaceous glands, fingernails, etc.

[Example] (2017 Hebei Cangzhou Simulation) The skins of many animals can be used to process belts, leather jackets, leather gloves, etc. These products can withstand a certain amount of extrusion and friction, mainly due to the skin ()

A. The cells in the stratum corneum have become keratinized.

B. Cells in the germinal layer have the ability to divide

C. There are many elastic fibers and collagen fibers in the dermis

D. There are abundant blood vessels in the dermis

Analysis: The dermis contains a large amount of elastic fibers and collagen fibers, which gives the skin a certain elasticity and toughness and can withstand a certain amount of friction and extrusion.

Answer C

Knowledge point 2: Sweat secretion discharges some metabolic wastes

1. Structural characteristics of sweat glands

Sweat glands include two parts: secretory part and duct. The secretory part is located in the deep dermis or subcutaneous tissue and is composed of coiled tubes with capillaries surrounding it. The ducts are long and thin and open on the surface of the skin.

2. Function of sweat glands

Sweat gland secretory cells absorb water, inorganic salts, urea and other substances from blood vessels to form sweat. Sweat reaches the body surface through the ducts and is discharged. At the same time, it also takes away part of the body's heat and regulates the body's body temperature.

Skin and sweat secretion PPT, Part 2 content: Examination points

Test point: Identification and analysis of skin functions

[Example question] (2017·Shandong Jining Monthly Examination) The picture below shows the contraction and contraction of blood vessels in the skin when the outside temperature changes. Please read and analyze the picture. Which of the following statements is wrong ()

A. Figure A shows that when the outside temperature is high, the capillaries in the skin dilate and the blood flow increases.

B. Figure B shows that when the outside temperature is low, the amount of heat dissipated through the skin decreases.

C. The skin can regulate body temperature, and related structures include capillaries and sweat glands.

D. Picture B shows that the human body tends to sweat more.

Analytical Figure A shows that when the outside temperature is high, the capillaries in the skin dilate, blood flow increases, and the amount of sweat formed increases, thereby taking away more heat from the body; Figure B shows that when the outside temperature is low, the capillaries in the skin increase. Capillaries constrict, blood flow decreases, the amount of sweat formed also decreases, and heat dissipation through the skin decreases.

Answer D

Skin and sweat secretion PPT, part three: detailed explanation of textbook issues

Activity "Observing the Structure of the Skin" Discussion Questions

1. What are the characteristics of each part of the skin? Speculate the functions of different structures.

hint

2. In what part of the skin are sweat glands located, and through what structure are they connected to the body surface?

Tip: Sweat glands are located in the deep dermis or subcutaneous tissue and are connected to the body surface through ducts.

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:

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"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..

"Skin and Sweat Secretion" PPT:

"Skin and Sweat Secretion" PPT Part One Content: Situation Introduction Skin is exposed to the outside all year round and exposed to many bacteria. Why does it not 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 the cause of acne? What’s the reason? Man-made..

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Update Time: 2024-10-04

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