Brain PopBrain Pop

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Tasha finally got the chance to go on Tasha finally got the chance to go on her favorite Norwegian Cruise ship. her favorite Norwegian Cruise ship.

However, one day into the cruise, the However, one day into the cruise, the ships meets a storm and leaves every ships meets a storm and leaves every

passenger stranded on an island. If passenger stranded on an island. If Tasha and her family are not rescued Tasha and her family are not rescued

and only have salt water to drink, and only have salt water to drink, explain why they would all die/perish.explain why they would all die/perish.

Solvent –vs- Solute

Solvent substance with

dissolving capability, thus can dissolve another substance. Solvents can be in a liquid, gaseous or solid state.

Solute substance that

dissolves in a solvent in order to form a solution. Solutes can be in liquid, gaseous or solid phase

Solvent + Solute=…Solvent + Solute=…

Solution..Solution.. homogeneous mixture of two or more

substances. It is called a homogenous mixture.. Same

throughout No separation

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Plasma MembranePlasma Membrane

Is a Is a selectively selectively permeable lipid permeable lipid bilayerbilayer found in all found in all cells.cells.

Able to regulate what Able to regulate what enters and exits the enters and exits the cell, thus transportcell, thus transporting ing materials for a cell’s materials for a cell’s survival. survival.

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What is the makeup?What is the makeup?

The cell membrane consists primarily of a The cell membrane consists primarily of a thin layer of thin layer of bilipid cellsbilipid cells

Arrange so that the Arrange so that the hydrophobichydrophobic (water (water hating) "tail" regions are shielded from the hating) "tail" regions are shielded from the surrounding polar fluid surrounding polar fluid

HydrophilicHydrophilic (water loving) "head" regions (water loving) "head" regions faces the extracellular polar fluidsfaces the extracellular polar fluids

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HomeostasisHomeostasis

Defined as the ability to maintain stable Defined as the ability to maintain stable internal conditions in spite of the internal conditions in spite of the changing external conditions.changing external conditions.

Diffusion:Diffusion: Movement of a substance Movement of a substance from a higher concentration to a lowerfrom a higher concentration to a lower

OsmosisOsmosis Ability of a fluid to pass through a Ability of a fluid to pass through a

semipermeable membrane from an area of semipermeable membrane from an area of higher concentration to lowerhigher concentration to lower

3 Types of Osmotic solutions…3 Types of Osmotic solutions…

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1. Hypotonic

Cell will experience a net gain of waterThis solution contains a lower concentration of solutes than the cell and therefore a higher concentration of waterConsequently, water will flow into the cell

2. Hypertonic

Cell will experience a net loss of water Contains a higher concentration of

solutes than the cell, therefore a lower concentration of water.

Consequently, water will flow out of the cell.

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3. Isotonic

Cell will experience neither a net gain nor loss of water.

This type of solution contains an equal concentration of solutes as the cell and therefore an equal concentration of water.

Consequently, water will flow equally into and out of the cell.

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3 Types of Osmotic Solutions

Discussion…Discussion… Tyrone wanted to make sure he drank Tyrone wanted to make sure he drank

enough water before he started school. enough water before he started school. He drank 5 liters of water and headed He drank 5 liters of water and headed out. Standing up, he felt dizzy and out. Standing up, he felt dizzy and passed out. passed out.

He later died…. Why?He later died…. Why?

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