Cell mebrane and passive transport

bioloigy

what else is the cell membrane known as

plasma membrane

what does the plasma membrane contain

phospholipids, proteins, and cholesterol lipid bilayer

what parts do a Phospholipids have

a hydrophilic head and hydrophobic tails(they can move around in the cell membrane)

What is selectivly permeablity(info)

The property of the plasma membrane that allows certain molecules to pass while restricting others, thus maintaining homeostasis within the cell.

what can pass through permeable objects and what cant

small nonpolar molecules, water, some ions, and large and polar molecules cant

If molecules cant fit through the cell membrane where else can they pass through

transport proteins

what is dynamic equilibrium?

balance between the inside or outside like of a cell

why is it important for a cell to be selectively permeable

It allows the cell to maintain homeostasis by controlling which substances enter and exit also allowing it to protect the cell by not allowing virus and bacteria in

what would happen if the cell wasn’t selectively permeable?

The cell would not be able to maintain homeostasis, as it couldn't control what enters and exits. Harmful substances could enter, and essential substances could leave, leading to cell dysfunction or death.

what is an ion channel

special channel used in passive transport allows ions in and out of the cell with the concentration gradient.

what is osmosis

The movement of water across a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration.

How many ways and how can water enter the cell

Because of the cells high demand for water and waters polarity only allowing it to enter the cells slowely through the membrane the cell membrane has aquaporins to allow water to move in and out of the cell quicker and more efiicent.

Define Tonicity

compares the amount of solute disolved in a solvent.

what is the defintion of hypertonic

A solution with a higher concentration of solute compared to another solution, typically causing water to move out of a cell.

what is the defintion of hypotonic

a cell is in a hypotonic solution if the concentration of water inside the cell is LOWER than the concentration outside the cell.

what is the defintion of isotonic

equal percent of solute and solvent inside and outside the cell or area(no net movement)

Saline solution (salt solution) is used to soak and rinse contact lenses. Is it hypertonic, hypotonic, or

isotonic compared to the cells of an eye? Explain your answer.

When you eat a bag of salty chips, explain in terms of diffusion and osmosis why your lips get

chapped and you get thirsty.

When you eat a bag of salty chips, explain in terms of diffusion and osmosis why your lips get

chapped and you get thirsty.

You are stranded on a boat in the middle of the ocean and have no more bottled water to drink. Yet there is plenty of seawater around you. Explain in terms of diffusion and osmosis why you should not drink the seawater. What would happen to you if you do and why?

A marine water fish is placed in fresh water. Explain in terms of diffusion and osmosis what would happen to the fish.

What happens to your skin when you sit in a bath for a very long time? Explain why it happens in terms of osmosis and diffusion. Is the water around you hypotonic, hypertonic, or isotonic when compared to your skin cells?

becomes wrinkled and swollen (pruney). This occurs because the water surrounding your skin cells is hypotonic compared to the fluid inside them, causing water to move into the cells via osmosis

The lipid bilayer is described as being fluid. How does this characteristics help the cell membrane with its functioning

allows the membrane to be dynamic and flexible, enabling essential processes like the movement of proteins, transport of molecules, cell signaling, and cell division

Uses ATP to move molecules

protein pump

where is the interstitial fluid located

outside the cell

which size cell is the most efficient at obtaining nutrients

Smaller cells