First 10 minutes of class

 Cell Race  Review graphic organizer  Notes  Cell Test-Tuesday 10/2

 Smallest unit of all living things  Composed of organelles  Each organelle performs specific jobs so the cell can do it’s job

 Cell membrane  Nucleus  nucleolus  Chromatin  Nuclear envelope  Microvilli  Cytoplasm  Mitochondria  Golgi body  Endoplasmic Reticulum  Ribosome  Centrioles

 Describe three organelles discussed yesterday  Three lines

 Discuss cell  Continue notes  Cell diagram and plasma membrane diagram color and label

 The barrier surrounding each cell  Separates the cells contents from the surrounding environment  Is selectively permeable  This is the cells way of maintaining boundaries

 Phospholipid bi-layer  Meaning two layers  Each layer consists of a lipid tail connected to a phospo- head  The tails face each other, away from the external or internal environments

 Hydrophobic ◦ The lipid tails are water insoluble ◦ They are “water fearing” ◦ They are non-polar  Hydrophilic ◦ The protein heads of each Phospholipid is water soluble ◦ They are “water loving” ◦ They are polar and interact well with other polar substances

 1. Proteins ◦ a. Peripheral proteins act as binding sites or receptors ◦ b. Integral proteins- proteins that span the membrane act as transport protein ◦ c. Glycoprotein- act as markers, which allow your cells to be recognized as “self” cells  2. cholesterol ◦ Help to stabilize the plasma membrane

 Channel Proteins ◦ Passive movement of material through pores  Carrier proteins ◦ Molecule will bind to the carrier protein causing it to open, allowing passage into the cell

 Use passive transport ◦ Do NOT require energy ◦ 1. diffusion- molecules move across membrane through pores along a concentration gradient (high to low) ◦ 2. filtration-movement of water and other solutes from high to low concentration  Based on a difference in water pressure between external and internal environment  Pushes out solutes  Occurs in the kidneys

 Facilitated diffusion- ◦ concentration gradient still needed ◦ Protein carrier is used because molecules are too large to enter pores ◦ Still passive transport, just needs help ◦ No energy because it is using a gradient  Solute Pump (example Na/K exchange pump) ◦ Moves molecules or ions too large to enter on own AGAINST a concentration gradient ◦ REQUIRES ENERGY (active transport)

 Several junctions are present in order for the cells to continue doing their jobs, while communicating with adjacent cells all the while staying anchored to each other!

 Membrane junctions: ◦ Tight junctions ◦ Desmosomes ◦ Gap junctions ◦ Microvilli