论文部分内容阅读
要通过澄清血液的演示来介绍血液的成分。学生会看出血液被分为两层,一层是透明的血浆;另一层是稠密的、不透明的,这是由血球组成的。教师应使学生注意到存在於血浆与红血球之间的那层灰白色的薄膜,这是由白血球组成的。观察血液的澄清,能向学生清楚的指明血液的成分、血浆的透明特性和颜色、各种血球的颜色以及白血球和红血球的相对数量。教师应让学生根据对澄清血液演示的体会,在练习本上绘出血液成分的图解。
To clarify the blood through the demo to introduce the composition of the blood. Students will see the blood is divided into two layers, one is the transparent plasma; the other is dense, opaque, which is composed of blood cells. The teacher should bring the student to notice the grayish white film that exists between the plasma and the red blood cell, which is composed of white blood cells. Observe blood clarification, to students clearly indicate the composition of the blood, the transparent nature of the blood and color, the color of various blood cells and the relative number of white blood cells and red blood cells. The teacher should ask the student to draw a graphic representation of the blood composition on the exercise book, based on an understanding of clarifying the blood presentation.