TRANSPORTION & HOMEOSTASIS How cells maintain life.

WHICH CELL ORGANELLE IS INVOLVED? THE CELL MEMBRANE!!!!!!

CELL MEMBRANE SELECTIVELY PERMEABLE -LETS CERTAIN THINGS IN & OUT MADE OF LIPID BILAYER WITH PROTEINS

HOMEOSTASIS A set of various internal conditions that an organism must maintain.

TYPES OF MOVEMENT IN & OUT OF A CELL PASSIVE TRANSPORT -DIFFUSION -OSMOSIS -FACILITATED DIFFUSION ACTIVE TRANSPORT -PROTEIN PUMP -ENDOCYTOSIS -EXOCYTOSIS

PASSIVE TRANSPORT MOVEMENT OF SUBSTANCES ACROSS THE CELL MEMBRANE WITHOUT ANY INPUT OF ENERGY BY THE CELL. MOLECULES MOVE DOWN THE CONCENTRATION GRADIENT. DIFFERENCE IN THE CONCENTRATION OF MOLECULES ACROSS SPACE

Concentration Gradient Passive Transport

DIFFUSION SIMPLEST FORM OF PASSIVE TRANSPORT MOVES MOLECULES FROM AN AREA OF HIGHER CONCENTRATION TO AN AREA OF LOWER CONCENTRATION UNTIL EQUILIBRIUM IS MET. KINETIC ENERGY-constant motion -molecules will move in a straight line unless they hit another object.

OSMOSIS

NOT…OSMOSIS JONES

OSMOSIS DIFFUSION OF WATER THROUGH A SELECTIVELY PERMEABLE MEMBRANE. WATER TENDS TO DIFFUSE FROM HYPOTONIC SOLUTIONS (areas of low molecule concentration) TO HYPERTONIC SOLUTIONS (areas of high molecule concentration) UNTIL THE SOLUTION IS ISOTONIC (equal concentration).

Solutions of Osmosis HYPERTONIC SOLUTION EX-when the concentration of solutes in one solution is higher than another. HYPOTONIC SOLUTION EX- when the concentration of solutes in one solution is lower than another. ISOTONIC SOLUTION one solution is equal to another.

EX-when the concentration of solutes in Solutions of Osmosis HYPERTONIC SOLUTION (concentration of water is lower than another solution) EX-when the concentration of solutes in one solution is higher than another. HYPOTONIC SOLUTION (concentration of water is higher than another solution) EX- when the concentration of solutes in one solution is lower than another. ISOTONIC SOLUTION (concentration of water is equal to another solution) one solution is equal to another.

                              

WATER MOVEMENT IN RED BLOOD CELLS

OSMOSIS IN ACTION HYPOTONIC HYPERTONIC ISOTONIC

QUESTION #1 WHAT TYPE OF SOLUTION WOULD THE OUTSIDE OF THE CELL BE IF THERE WERE A LOWER CONCENTRAION OF MOLECULES (SOLUTES) ON THE OUTSIDE OF THE CELL?

AND THE ANSWER IS… HYPOTONIC

WHAT DIRECTION WOULD THE WATER (SOLVENT) TRAVEL, IN QUESTION 1?

AND THE ANSWER IS… IN THE CELL

QUESTION #3 GIVEN THE SITUATION IN QUESTION 1, WHAT TYPE OF SOLUTION IS ON THE INSIDE OF THE CELL?

AND THE ANSWER IS… HYPERTONIC

WHY IS IT SOOOOO BAD TO DRINK SEA WATER???? YET ANOTHER QUESTION… WHY IS IT SOOOOO BAD TO DRINK SEA WATER????

AND THE ANSWER IS…… THE SEA WATER IS SALT WATER. IF YOU DRINK THIS WATER THEN YOU ARE CREATING A CONCENTRATION GRADIENT WHERE YOU HAVE LESS WATER SURROUNDING YOUR CELLS WHICH WILL MAKE THE WATER THAT IS INSIDE YOUR CELLS TRAVEL OUT BY THE PROCESS OF OSMOSIS.

FACILITATED DIFFUSION WHEN MOLECULES CAN’T DIFFUSE THROUGH THE MEMBRANE BY THEMSELVES. THE MOVEMENT OF THESE TYPES OF MOLECULES IS ASSISTED BY MOLECULE SPECIFIC CARRIER PROTEINS IN THE CELL MEMBRANE.

WHAT IS THE DIFFERENCE BETWEEN DIFFUSION & FACILITATED DIFFUSION? QUESTION # 4 WHAT IS THE DIFFERENCE BETWEEN DIFFUSION & FACILITATED DIFFUSION?

AND THE ANSWER IS… FACILITATED DIFFUSION MOVES MOLECULES,IN & OUT OF THE CELL, WITH THE HELP OF THE PROTEINS IN THE CELL MEMBRANE

ACTIVE TRANSPORT REQUIRES ENERGY FROM THE CELL MOVEMENT OF MOLECULES FROM AN AREA OF LOWER CONCENTRATION TO AN AREA OF HIGHER CONCENTRATION MOVEMENT GOES UP THE CONCENTRATION GRADIENT. Examples: sodium-potassium pump, endocytosis, exocytosis.

Concentration Gradient Active Transport

QUESTION # 5 WHAT ARE THE 2 DIFFERENCES BETWEEN ACTIVE TRANSPORT AND PASSIVE TRANSPORT?

AND THE ANSWER IS… ACTIVE TRANSPORT REQUIRES ENERGY FROM THE CELL & PASSIVE TRANSPORT DOES NOT. ACTIVE TRANSPORT MOVES UP THE CONCENTRATION GRADIENT & PASSIVE TRANSPORT MOVES DOWN THE CONCENTRATION GRADIENT.

WATER & OUR CELLS Most people lose almost two liters of water in a day through perspiration, respiration, and waste removal. Include a hot humid day, strenuous work, or athletic activity and the amount of fluid loss multiplies significantly. Water is crucial to healthy cells. When cells are deprived of water, they become dehydrated. Dehydrated cells do not function properly and are unable to rebuild, heal themselves, or remove waste efficiently.

WATER & OUR CELLS Most people do not know that they are dehydrated. They feel they are replenishing their body with water through coffee, alcohol, or soft drinks. The caffeine, alcohol, and sugars contained in these liquids actually contribute to dehydration and introduce toxins.

THAT’S ALL FOLKS!!!!!