Nutritional-What kind of food more than calcium
December 17, 2007
one questions the introduction of new courses
Teacher: As the saying goes: “People are iron, steel and rice for dinner do not eat hungry up fast enough. “Why do students think about every day, we eat all kinds of food?
Health: nourishing food.
Students: do not eat food will starve to death.
Health: The food contains many nutrients.
Teacher: Yes, a lot of foods contain nutrients. On food nutrition, you want to know what?
Health: What foods contain nutrients.
Health: How can I make nutritious.
Teacher: students have raised a very pertinent. This lesson, let's examine the nutritional components in food issues.
【Comments: teachers from every day, “Why eat a variety of food” to start and guide students as they want to study. Questions from students in real life, this convergence of scientific inquiry activities and daily life, so that students are eager to carry out exploration activities, find answers, explore the desire to stimulate the students. 】
Second, design experiments and independent research
1. Understanding of the body's nutritional needs
Teachers: foods which contain nutrients the body needs, these nutrients on the human body and what effect? The teacher before class so that we collected relevant content, please bring your group to collect information and exchange about other students. (Student exchange.)
Teacher: Which representative group of students willing to talk about, what information you collect?
Health: Vitamins are essential to the human body many types, such as vitamin A, vitamin B, vitamin C, vitamin D … … gums bleeding easily a lack of vitamin C, vitamin A eye will get sick, lack of vitamins D skeletal development is not good, a lack of vitamin B12 likely oral ulcers of Health.
Health: Human body parts are major components of the protein. For example: skin, muscles, bones, viscera, brain and so on. No body no protein, no life.
Health: Water is the main component of body composition, meat, bone, blood, contain water, accounting for 60% of body weight of 70%.
Teachers: Who collected different information?
Health: the human body regardless of what activities carried out – walking, running, jumping, reading, writing, thinking, digestion, breathing and so needs to consume energy, starch, fat is the body's energy materials. Without energy the body can not carry out various activities.
Health: salt is iron, calcium, potassium, sodium, iodine and other elements of nutrients, we eat salt, but a kind of salt is a sodium containing salt.
Teacher: Students really great to know so much knowledge. These nutrients are essential to the human body. In addition to food containing these nutrients, it also contains other nutrients. Now we come to study several key nutrients. After class, students share the information you have just posted on the walls around the classroom to demonstrate to other classmates.
【Comments: The layout of the students before class and extensive collection of nutrition-related information, leading them through various channels to understand the nutritional content of food. Lead students to freely talk about the class of food nutrition awareness, thereby narrowing the living world and the book world distance to reach the purpose of resource sharing, and then train the students to collect, collate information so as well with people and feedback skills . 】
2. Explore the starch test methods.
Teacher: We all know what the main components of flour in it?
Health: starch.
Teacher: cooking at home when we used to thicken the powder face is starch, starch from foods containing refined out. Next we do a race – “striving to Little Chef,” you like it?
Health: Yes.
Teacher: The plastic bag package is dough, first please bring plastic bags to open, let the dough exposed. This is the iodine bottle and filled, we start with a cotton swab dipped with iodine in your 10 fingers were sterilization. We look first, what is the color of iodine?
Health: a little yellow.
health: close to yellow.
Teacher: Well, for a teacher, said first, second, everyone go get the dough Chenmian article, see who stretch faster. Ready? One, two start. (Students hands-Chenmian article.)
Teacher: Students stretched noodles were great, almost as a chef at the. What do you find it?
Health: Our noodles how to become a black?
Health: My noodles into a deep blue.
Teacher: Really? other students do?
Health: Black has also changed.
Teacher: is pure black it?
HEALTH: It should be turned into a blue-black.
Teacher: This is how going on? Ask someone to discuss, noodles turns blue and what factors. (Student group discussions.)
Teacher: Who to talk about your idea?
Health: Be sure and iodine the hands.
Students: dough is the main component of starch, we have with iodine, iodine starch face turned blue.
division: case of iodine starch can become blue, which is specific to the nature of the starch. In this way we can test whether the food contains starch.
【Comments: The creative use of materials that teachers can design instruction link, so that students do, “Chen Mian article” game. Students identify problems through the game, cause for reflection and produce association, in a good learning environment in the study as a kind of fun – “Teaching within interest” in order to find the answer. 】
Teacher: Today, teachers bring a lot of food, how can it know whether they contain starch? What you think of a good way?
Health: iodine to the food drops.
HEALTH: put iodine drops in the food and see no change to blue black color of the indicator foods containing starch.
Teacher: This is a good idea. We look at the table called the dropper to this equipment, what use is it?
Health: The iodine dropper to drop food.
Health: absorption of some iodine with dropper and then drop the food.
Teachers: The following were to try to ask someone, and in accordance with these foods do not contain starch and starch into two categories. (Grouping experiments distinguish between food, visiting teachers guide.)
Teachers: Who to talk about which foods contain starch?
Health: We group the iodine drops in a variety of food, respectively, found that rice, bread, potatoes, egg yolk, place biscuits were stained with iodine into blue black, indicating that these foods contain starch.
Health: Our group of proteins also contain starch.
Teacher: We have different opinions?
Health: protein does not contain starch.
Teacher: We have different opinions, there are differences in how should I do?
Health: an experimental test what do.
Teachers: Science use the facts speak for, please check again about protein if it contains starch. In the experiment must be careful to see which part of a problem. (Students re-test.)
Teacher: So in the end containing proteins do not contain starch? Please just say that students said.
Health: protein should not contain starch, and my first experiment, proteins stained with egg yolk, egg yolk contains the starch is turned into a blue-black.
Teacher: The students in the experiment and can find problems and correct, very great.
【Comments: The teachers in the experimental process of the correct treatment of students with different views, with encouragement and praise individual students treated eyes flashing sparks, and promptly led the students to use scientific methods to find the right answer. 】
3. Explore fat testing methods.
(slightly.)
4. explore methods of protein tested.
(abbreviated.)
3, with practice to solve the problem
Division: Food and Nutrition is a science test. We have just test protein, fat and starch is used in our laboratory the most convenient way. Nutritionists will use more accurate equipment to test. Only through the actual test, to determine what various foods contain nutrients, how much content, so as to better with food, nutrition do catering.
Teacher: So you know what these nutrients present in food it?
Health: milk contains a lot of calcium.
Health: There are many iron celery.
Health: orange contains vitamin C more.
Health: There is more carrot vitamin A.
Health: tofu more calcium, protein, a lot.
Health: kelp, seaweed contains iodine.
Teacher: What kind of food it contains all the nutrients the body needs?
Health: no.
division: human growth and development needs of a variety of nutrition, what food did not contain all the nutrients the body needs, then how should we do?
Health: Eat a variety of food.
Health: not picky eaters, do not eclipse.
Health: a reasonable match, nutrition catering.
Teacher: So do not eat as much as possible?
Health: Eating too bad.
Health: Eating too much will become fat children's.
【Comments: to enable students to understand the importance of comprehensive and rational nutrition, to enhance students and people around them care for their health awareness, to know science diet is to ensure healthy growth. 】
Teachers: Students learn so much about nutrition knowledge, almost as an expert in this area. Teacher that several patients (slide show).
1. Xiao Ming just 10 years old, has 100 pounds, and every little movement flustered asthma.
2. Xiaoqiang aunt had very good health, was found to gradually thicken the neck.
3. Xiaohua got night blindness, Every evening, the sight on the sharp decline not see the object.
4. Gang child grows short, walking legs to lose control, often Shuaigen Tou.
5. Lingling not eat, the body is weak and often dizzy, cold.
Teacher: who read the medical records. (Students read medical records.)
Teacher: Now you can with a nutritionist to help the teacher to the identity of these patients medical treatment, diagnosis, etiology, and for the condition to open a “prescription” mean? The following group discussions on the students to express, to study your own case of interest, and identify methods of treatment. (Student group discussion, analysis and diagnosis.)
Teachers: Who to talk, you to speak with the patient the diagnosis? His disease is caused by the reasons?
Health: Our group of 5 patients Lingling to diagnosis, her disease is caused by malnutrition.
Teachers: gave her a “prescription” it, how she should be doing: she should eat nutritious food, not picky eaters.
Teacher: You're very targeted. Other group?
Health: Xiao Ming too fat, may be the right nutrition! Should eat more vegetables, fruits, less meat, but also much more movement.
Teacher: Do you diagnose well and made out a “prescription.”
Health: In the book I've seen a lack of vitamin A cause night blindness, and Xiaohua should eat more foods containing vitamin A, such as carrots.
Teacher: Yeah you are will prescribe the right medicine!
Health: I think Xiaogang must be calcium deficiency, and to eat food such as tofu and milk, but also often sun.
Health: I think Lingling weak, it should be up at Zinc, I was a kid to drink zinc gluconate.
Health: Small aunt was a strong possibility of a “rough neck root” disease, is caused by iodine deficiency. She should eat seaweed and kelp.
Teacher: You almost become a famous doctor, not a miracle-working doctor Hua Tuo reincarnation of it! “Rough neck root” disease in medicine is “to a disease”, is indeed caused by iodine deficiency.
【Comment: show life in common and balanced nutrition-related diseases and guide students to use knowledge and diagnose the illness. Contact real life, students to connect knowledge gained, applied to real life. This further strengthened the understanding of nutritional balance on the important role of human growth and development of improved guidance to life science students, the ability to improve quality of life, the harmonious development of the knowledge and skills. 】
Teacher: We have a very accurate diagnosis, the future will continue to be a real nutritionist. Just now we are just a simulation clinic, if the students are really sick, not feeling well, then how to do?
Health: go to the hospital.
Health: to the hospital to find a real doctor.
Teachers: right is right, 10 million prescriptions are neither easily diagnosed Oh!
IV summarizes the expansion of extended
Teacher: Today we looked at the food and nutrition knowledge, talk about What do you gain?
Health: I know not picky eaters, the importance of a comprehensive nutrition.
Health: I know what foods contain nutrients.
Health: I know how to do experiments, group work to succeed.
division: after school ask you to design a set of three meals a day for their own recipes, recipes designed to see who both scientific and reasonable.
【Comments: Students explore the science, often a class can not be completed. Can not be teaching on the class of the ring as the starting point and end, to attach importance to guide the students to follow-up activities after school. 】
General Comments:
“food nutrition” teaching a lesson, teachers to the development of students, respect for individual student performance, with food as the carrier, through research “eat” the problem, leading students to start from things that are familiar from everyday experience of the activities began, a series of scientific inquiry activities, and guide students about the scientific side, thus deepening the process of scientific inquiry. The teaching materials used at different levels, in the “independent innovation” to make a fuss, and strive to achieve to independent research-based, students explore the good sense to improve scientific literacy. Encourage students to identify problems from different angles, to find solutions to problems independently, thus enabling them right food, the nutrient from the “emotional” know up to the “rational” understanding, recognizing the importance of balanced nutrition, to achieve the active construction of knowledge and ability . Greater knowledge of teaching and the ability, emotional attitude to cultivate organic combination of, truly a “use textbooks to teach” rather than “teaching materials.” To mobilize students to gather information before class, class organizations to share, to achieve “resource sharing.” Increase for teaching design, “Chen Mian article”, “model clinic” This kind of exploration activities to a new view of food to show students the relationship between nutrition and health so that students play high school, playing in the thinking and playing in access to new knowledge.
emotional attitude towards students is not something that can be done, but to create opportunities to accumulate through participation in activities for students to feel, experience and internalization. Harmonious teacher-student relationship, students actively explore the persistent spirit of motivation among teachers and students with a comprehensive assessment, inquiry activities, students are essential.