1. 2.3 and 2.4 The Need for Cellular Division and Cell Specialization Text pages 49-53

2. The Big ideas Cells are specialized to carry out specific functions Vocabulary Words Cell specialization Mucus Hemoglobin villi

3. 2.3 The need for cell division Why are we composed of many small cells instead of one big cell? – Two objects with the same volume (amount of space inside) but different shapes have different surface areas – What are the advantages to being small?

4. What are the advantages to being small? Large surface area (a lot of cell membrane, CM) and a small volume -Messages to travel quicker (nucleus to CM distance) -Use less energy for transportation -Any cell that does a lot of “work” is small -Efficient/good at taking in lots of nutrients and getting rid of waste (more areas to use on CM)

7. What are advantages of being big? -Do not do a lot of work -More organelles to use -Do not need as many nutrients or produce as much waste (not as active) -Used for storage or structure

8. What happens when a cell gets to big? When a cell reaches a certain size, it has made a copy of all of its organelles and it divides into two new cells (mitosis)

10. 2.4 Cell Specialization Many different types of cells Each designed to carry out a specific/special function