This lesson is the beginning of Unit 2 "ourselves". In this lesson, students will purposefully observe the overall structure of the body and try to observe the invisible musculoskeletal and internal organs. We will understand the basic internal and external structure of the body by combining the whole observation with the previous observation of animals and plants.

The teaching objectives of this lesson are as follows:

Scientific concept goal

1. The basic structure of our body is divided into head, neck, trunk and limbs, and the shape of our body is symmetrical.

There are many invisible structures inside the body, such as bones, muscles and heart.

Scientific inquiry goal

1. Can observe and describe the external structure of the body.

2. Be able to explore the internal situation of the body by touching and listening.

Scientific attitude goal

1. Try to observe in different ways to confirm your observation results.

2. Be able to describe your observations truthfully.

Scientific, technical, social and environmental goals

It can be found that people are similar in physical structure, but there are always some differences in appearance.

Reflection: 1. Some students know or have heard that the human body has skin, muscles and bones. But most students are unclear or incomplete.

2. With regard to symmetry, junior two students have already got some understanding in math class, so it is relatively easy to achieve the scientific concept goal of "symmetry of human body shape". But the three scientific words "trunk", "neck" and "limbs" are unfamiliar to students. Not very good at using it.

3. Students have mastered "observation" and are interested in listening to the sounds of internal organs with their ears. But I can't use a stethoscope yet.

Considering the above situation, in the teaching of "which parts of the body", besides letting students observe first, guessing may be divided into several parts; Then show scientific vocabulary, and finally exercise students' use of scientific vocabulary in the form of I mean you.

When teaching things inside the body, in order to let students know about skin, bones and muscles. I guide students to feel with different gestures: touch their cheeks/arms/abdomen with their fingers to feel the skin; Gently press the elbow joint/knee joint/forehead with your fingers to feel the bones; Gently pinch your thighs and arms with your thumb and forefinger and feel the muscles. Finally, PPT shows the schematic diagram of the three as the focus.

Finally, guide students to use stethoscope to get a preliminary understanding of the internal organs of the body.

After class, the students were given an oral test, and the words "left and right symmetry, trunk, skin, muscles, internal organs" were firmly grasped by the students.