Cell membrane ppt

Open Ended

Why do you think living cells need to have a boundary or membrane around them? What might happen if they didn’t?

Open Ended

Based on the pictures you just saw, what do you think you observed?

Open Ended

• What shapes or patterns do you notice?

• Do you think some parts have a special job? Why?

• Why do you think there are different parts?

​The membrane is crucial to cell life and function, without the

cell membrane. there is no cell!

Without the cell membrane:

• The cell wouldn’t be able to maintain a controlled environment, leading to potential harm from toxic substances.

• The cell would lose important molecules and nutrients.

• It would be vulnerable to external forces, unable to separate its contents from the external environment, which could affect its survival.

Lipids make up a lot of the cell membrane.

• Phospholipids are the main component. There is a bilayer of phospholipids - heads on the outside that contact with water inside and outside of the cell.

• The tails of the phospholipids face each other creating a hydrophobic layer in the inside of the membrane bilayer.

• This hydrophilic-hydrophobic-hydrophilic membrane creates layers that prevent most molecules from entering or exiting the cell.

Lipids make up a lot of the cell membrane.

• Cholesterol is another lipid molecule that is found in the membrane. Cholesterol molecules affect the fluidity of the membrane.

• Cholesterol helps keep the membrane from freezing or overheating in extreme temperatures

• Besides the membrane's lipid molecules, some proteins and sugars affect how the cell membrane works.
  
  

• Sugar molecules attached to lipids and proteins are important signaling molecules. They stick out of the cell's surface and can contact receptors on the outside of other cells