Science Starter Pick up the Cell City Analogy Warm Up Sheet Read through the description of the city and do your best to assign each organelle to one of the underlined words You will have 7 minutes to complete this! Take out last nights homework for a quick check

Today’s Agenda Science Starter Organelle Review Cell Lab (Quick!) Cell Membrane Transport Exit Quiz

Understand the Structure of Cells and the Function of Organelles Objective 2.1a Understand the Structure of Cells and the Function of Organelles

Mitochondria

Ribosomes

Nucleus

Endoplasmic Reticulum

Golgi Apparatus

Protein

Cell Membrane (Plasma)

Lysosomes (Peroxisomes)

Nucleolus

Human Cheek Cell Lab We are going to visualize our own cells to see the true structure! Every group will need the following: Microscope Glass Slide and Coverslip Toothpick and Kleenex Before we start touching things a couple notes: Microscope use Methylene Blue Clean up

Human Cheek Cells Low Power High Power

Describe the Types and Importance of Cell Transport Objective 2.1b Describe the Types and Importance of Cell Transport

CELL MEMBRANE TRANSPORT Anatomy & Physiology

The Cell Membrane Semi-permeable (controls what can enter and leave the cell Helps the cell maintain homeostasis Made up of a double lipid layer

Plasma Membrane Proteins Functions of the proteins in membrane Composition varies widely among cell types channels transporters receptors intracellular junctions enzymes cytoskeleton anchors cell identity markers Transport Enzyme Receptor Anchor Cell Recognition Cell Joining

2 Types of Cell Membrane Transport PASSIVE TRANSPORT REQURIES NO ENERGY MOLECULES MOVE FROM A HIGH TO LOW CONCENTRATION TYPES: DIFFUSION FACILITATED DIFFUSION OSMOSIS ACTIVE TRANSPORT REQURIES ENERGY (ATP) MOLECULES MOVE FROM A LOW TO HIGH CONCENTRATION Ex: solute pumping and bulk transport

Osmosis – Isotonic Solution Example 1: Equal movement of water in and out of cells *the cell shape stays the same See page 45

Osmosis – Hypotonic Solution Example 2: More water moving into cells than is moving out *the cell will swell or grow larger See page 45

Osmosis – Hypertonic Solution Example 3: More water moving out of cells than is moving in *the cell will shrink or get smaller See page 45 Take the Section 1.3 Quiz

Endocytosis Cell transports molecules (such as proteins) into the cell Pinocytosis Phagocytosis Cell transports molecules (such as proteins) into the cell  Receptor-mediated endocytosis →

Exit Quiz What is the MAIN difference between active and passive transport? What are the types of passive transport? What are the types of active transport?

Plasma Membrane Junctions Tight Junctions: Impermeable junctions that encircle adjacent cells. Desmosomes: Anchoring junctions between cells. Gap Junctions: Communicating junctions that allow substance to pass from one cell to another.

DIFFUSION (PASSIVE TRANSPORT) Diffusion is the movement of particles from a high concentration to an area of low concentration. The smell of fresh baked cookies “spreading” throughout the room is an example of diffusion.

FACILITATED DIFFUSION (PASSIVE TRANSPORT) Diffusion of molecules through membrane channels with the help of proteins in the cell membrane

OSMOSIS (PASSIVE TRANSPORT) Osmosis is the diffusion of water through a semi-permeable membrane. Osmosis occurs when water particles move from a high concentration to a low concentration. Osmosis is how the cell gains and loses its needed water.

Active Transport – Solute Pumping ATP energy indirectly to move substances ATP energy drives an ion pump to create a concentration gradient; then a carrier protein uses the energy of the concentration gradient to “drag” or “push” transport of another substance(s) by facilitated transport A Na+ ion and a glucose bind to the symport, then the symport transports the glucose and Na+ ion inside the cell.

Bulk Transport Exocytosis The transfer of large molecules and fluids across membranes via vesicles using ATP energy. This type of transport mechanism includes exocytosis and endocytosis. Exocytosis