"Metabolic Waste Produced by the Human Body" PPT courseware

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"Metabolic Waste Produced by the Human Body" PPT courseware

Part One Content: Learning Objectives:

① Master the 3 ways of excreting metabolic waste from the human body.

②Types of excreted waste.

③The significance of excretion to human life activities.

Key points and difficulties in learning:

Focus: Definition of excretion

Three ways of excretion

Difficulty: the composition of excrement

Preparation before class

Equipment: alcohol lamp, glass slide, tweezers, dropper, lighter, paper towel, beaker or disposable cup

Material: fresh urine

Metabolic waste produced by the human body PPT, part 2 content: classroom experiment

experiment procedure:

1. Take a glass slide with your left hand.

2. Take the dropper with your right hand.

3. Use a dropper to draw some urine from the beaker.

4. Put a small drop of urine on one end of the slide.

5. Light the alcohol lamp.

6. Use tweezers to clamp the slide and move it back and forth over the flame until the urine is dried.

Observe experimental phenomena

(1) What smell do you smell?

(2) How is the urine?

(3) What is left adhering to the slide?

Note: Holding urine for too long will lead to the absorption of waste products in the bladder. The higher the concentration of urine and the higher the concentration of inorganic substances, which is very likely to lead to the occurrence of bladder stones. Therefore, it is not advisable to hold urine for a long time.

Metabolic waste produced by the human body PPT, Part 3: Generation of waste

Human cells decompose organic matter through respiration during metabolic activities, producing carbon dioxide, water, urea and other substances, which are metabolic waste.

Excessive accumulation of metabolic waste in the body will affect the normal activities of cells and must be excreted in time.

concept of excretion

The process by which the body excretes metabolic waste products (such as carbon dioxide, urea, excess water and inorganic salts) is called excretion.

Excretion in a narrow sense: excretion of metabolic waste

Excretion: defecation

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, metabolic waste produced by the human body PPT download, .PPT format;

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Update Time: 2024-11-24

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