2.3 and 2.4 The Need for Cellular Division and Cell Specialization Text pages 49-53.
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Transcript of 2.3 and 2.4 The Need for Cellular Division and Cell Specialization Text pages 49-53.
2.3 and 2.4
The Need for Cellular Division and Cell Specialization
Text pages 49-53
The Big ideas• Cells are specialized to carry out specific
functions
Vocabulary Words
• Cell specialization• Mucus• Hemoglobin• villi
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?
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)
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
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)
2.4 Cell Specialization
• Many different types of cells• Each designed to carry out a specific/special
function