"Human Food" PPT courseware

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"Human Food" PPT courseware

Part 1: Nutrition in food

What nutrients are found in human food?

Why do we need these foods?

Testing of nutritional components

Water testing

After baking, water droplets appeared on the walls of the test tube.

Detection of inorganic salts

The roasted seeds burn and leave behind a small amount of ash (inorganic salts).

Fat detection

Squeeze the embryo of the roasted seeds on paper, and oily spots will appear on the paper.

Human Food PPT, Part 2: Class Discussion

1. What is the purpose of setting up test tube B in the experiment?

Answer: Control further proves that the color change in the test tube is not caused by water.

2. Why do the colors of the solutions in test tubes A and B change differently?

Answer: Test tube A: purple reaction (blue-purple)

Test tube B: no color change (light blue)

Human food PPT, part 3: The role of nutrients in food

1. Water

The main component of cells, involved in various physiological activities

2. Inorganic salt

(1) Calcium deficiency - children: rickets; adults: osteomalacia (dairy products, dark green vegetables, beans)

(2) Iron deficiency - iron deficiency anemia (lean meat, fish, milk, eggs, beans)

3. Sugar

The main energy substance of the human body. Provides 70% of energy (cereals, potatoes)

4. Protein

Basic material of cells. Provide raw materials for human body growth and development, damaged cell repair and tissue renewal. (Lean meat, fish, milk, eggs, beans)

5. Fat

Reserve energy substances and regulate body temperature. (Meat, peanuts, sesame seeds, vegetable oil)

6. Vitamins

To maintain normal physiological activities, it is divided into water-soluble vitamins and fat-soluble vitamins.

Vitamin A deficiency - night blindness;

Vitamin B1 deficiency - beriberi;

Vitamin C deficiency - scurvy;

Microbial D deficiency - rickets in children and osteomalacia in adults

Human food PPT, part 4 content: test points

1. The nutrients in food mainly include six categories: water, inorganic salts, sugars, fats, proteins and vitamins.

Among them, carbohydrates, fats, and proteins can provide energy. They are called the "three major thermogenic nutrients". Fat provides the most energy; fat stores energy.

The main energy substance is sugar.

The main material that makes up cells is water, and the basic material is protein.

Inorganic salts are important substances that regulate the metabolism of certain tissues and organs of the human body.

Protein is an important raw material for human growth and development, tissue renewal and repair.

2. Use bis-diuretic reagent to detect protein, which will show a purple reaction; use indoxyl reagent to detect vitamin C, which will show a fading reaction.

3. The main sources of sugar are cereals and potatoes.

The main sources of protein are lean meat, fish, milk, eggs and beans.

The main sources of fat are meat, peanuts, sesame seeds and vegetable oils.

Plant foods do not contain vitamin A, but they contain carotene, which can be converted into vitamin A in the body. Animal foods contain vitamin A.

4. Night blindness---vitamin A deficiency;

Scurvy---vitamin C deficiency;

Beriberi---vitamin B1 deficiency;

Angular stomatitis, dermatitis---vitamin B2 deficiency;

Rickets---deficiency of vitamin D and calcium

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, human food PPT download, .PPT format;

For more information about the "Nutrition of the Human Body and Food for Humans" PPT courseware, please click the "Nutrition of the Human Body ppt and Human Food ppt" tag.

"Human Food" PPT download:

"Human Food" PPT Download Part One: Objectives and Key Points [Learning Objectives] 1. Try to analyze the nutrients in food and explain the important effects of various nutrients on the human body. 2. Improve experimental operation capabilities by exploring the nutritional components of food..

"Human Food" PPT:

"Human Food" PPT Part One: Think About It Do you know which organisms human food comes from? Why do we eat these foods? What nutrients can food provide us? do you know? 1. Have you ever eaten tofu? Its main...

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Update Time: 2024-10-24

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