Class: 7

Date: march 5 / 10

Item: osmosis


TRANSPO.GIF (514×298)

Osmosis

Is when nutrients or ions enter and leave; but the cell don’t spend energy.

The osmosis occurs for the concentration has been equals inside and outside of the cell.

The osmosis occurs in presence to a cell membrane.

Class: 8

Date: 09/03/10

Item: diffusion process and active transport

Diffusion

Is the spontaneous movement of particles from an area of high concentration to and are of low concentration.

Active transport:

Is when the cell spends energy, to transport molecules across the membrane, there are two types of passive transport endocytosis and exocytosis. Is when the cell enters as water and nutrient substances.

Endo= adentro

There are two types of endocytosis

1. Phagocytosis 2. Pinocytosis}

Phagocytosis: is the entry of nutrients through the membrane with energy spent.

Pinocytosis: the entry water into the cell, the membrane invaginates and forms a vacuole that waters enter in to the cell.

Exocytosis: the output of waste outside the cell in this process the cell spends energy.

date sábado, 13 de marzo de 2010
comments 0 Comments
more More...

TRANSPORT MEMBRANE

Class: 6

Date: march: Tuesday 02/10

Item: membrane transport

Membrane transport: it is entry and exit of nutrients thought of the membrane by pores or proteins.

Passive transport: The substances entry and exit without energy spend

Active transport: Entry and exit of nutrients and waste with energy Spend.

Passive transport:

the cell you want to find a balance between the concentration of salts internally and externally, to make this happen equilibrium enters the cell and removes ions.
Concentration gradient: the movement of ions according to the concentration of salts internally and externally.

By extreme conditions when concentrations as the cell must make an effort to enter on or remove ions. there are two states called plasmolysis and turgor.

Plasmolysis: when there is a greater concentration of salts or ions inside the cell and must work to remove them to the point that it loses all its water and plasmolisa and still not finish to balance out the salts.

Turgor: when there are many salts or ions and the cell has to enter them and not stand up and explodes.

date sábado, 6 de marzo de 2010
comments 0 Comments
more More...

homework

Homework:


What is active transport?
Answer:Active transport is the mediated process of moving molecules and other substances across membranes.
what is passive transport?
Passive transport or diffusion. Passive transport is the simple exchange of molecules of a substance across the plasma membrane, during which no expenditure of energy that provides the cell.
What is concentration gradient?
Concentration gradient is the difference in solute concentration between two solutions or media.An example: you have water in a container to which you add salt, but do not shake, by the time you add the salt, the highest concentration of salt will be at the bottom of the container, while the higher the concentration is minimal. This difference is the gradient.
what is osmosis?
Osmosis is a physical-chemical phenomena related to the behavior of water as a solvent for a solution to a semipermeable membrane for the solvent (water) but not solutes. Such behavior involves a simple diffusion through the membrane, without "spending power". Osmosis is an important biological phenomenon for cellular physiology of living beings.
What is broadcast?

Diffusion is a physical process irreversible, in which material particles are introduced into an environment that was initially absent, increasing the entropy of the joint formed by the scattered particles or solute and the environment in which diffuse or solvent.
Usually diffusion processes are subject to the Fick's law. The permeable membrane may allow passage of particles and solvent always in favor of concentration gradient. The release process requires no energy input, often as a form of cellular exchange.





date lunes, 1 de marzo de 2010
comments 0 Comments
more More...