生物教学中有些知识比较抽象,学生理解起来有一定的困难,利用教具进行直观性教学,有助于学生更好地认识理解相关的知识,可收到较好的教学效果。为了更好地演示神经兴奋的传导过程,特制作以下模型。材料:硬纸板(或薄木板)、刻刀、细铁丝(或长螺钉、螺母)、彩笔等。制作步骤:1.制作神经元模型。取30cm×60cm 硬纸板(或薄木板),按照图1所示画出神经元模型图,用刻刀沿紫色线刻出细缝,树突最左端和轴突末端保留小部分不刻断,以成为整体,细缝代表细胞膜。用彩笔在膜外围涂上1cm 宽的红色,代表正电荷,膜内涂1cm 宽的绿色,代表负电荷。细 Some knowledge in biology teaching is relatively abstract, and students have certain difficulties in understanding. Using teaching aids for intuitive teaching helps students to better understand and understand relevant knowledge, and can receive better teaching results. In order to better demonstrate the conduction process of nerve excitation, the following model was specially developed. Materials: cardboard (or thin board), carving knife, thin wire (or long screws, nuts), crayons, etc. Production steps: 1. Make a neuron model. Take 30cm × 60cm cardboard (or thin wood), according to Figure 1 shows a neuron model, with a slicing knife carved along the purple sew, the dendrite at the left most and axon end to retain a small part of the cut, As a whole, the slits represent the cell membrane. Apply 1cm wide red to the outside of the film with a crayons to represent positive charges. The film is painted with a 1cm wide green color to represent negative charges. fine