Osmosis and Homeostasis

A colonial organism

A group of more or less simular cells that live together in closely connected groups. example: Volvox

Chemical celluar signals change speeds, Why?

Can speed up or slow down the activities of the cells that receive and can change what the cells function is.

What does cell specialization mean

Each cell depending on one another to perform certain functions

Where are the receptors located

On the cell membrane, although the receptors for certain types of signals are inside the cytoplasm.

What completes a seriers of specialized tasks

Organs

many cells have water channel proteins known as

aquaporins.

proteins in the cell membrane act as

carriers or channels.

levels of multicelluar organization

cells make-up tissue then organ and organ make-up organ systems

Water moves quickly through a cell because it is surrounded by

fresh water causing it to swell.Eventually the cell may burst.

What is the process endocytosis

The membrane forms a pocket engulfingthe particle and pulls it into the cell

Osmotic pressure

The net movement of water out of or into a cell excerts a force known as this

In a plant cell an increase in water within the cell causes greater pressure describe the plant cell.

The plant cell become rigid

what has heppened when a cell is Hypotonic

The solution has a lower concentration than the cell. A net movement of water molecules causing it to swell

what has heppened when a cell is Hypertonic

The solution has higher concentration inside the cell. A net movement of water molecules causing it to shrink

An Hypotonic solution state is:

The solution is less concetrated outside the cell more than the inside.

An Hypertonic solution state is:

The solution is more concetrated outside the cell more than the inside.

How do cells balance the intake and loss of water

Through the use of osmosis.

vacuoles store materials like water.salts,proteins,and sugar.

a shrunken central vacuole does not give the same support to a cell as a full one.

What is Amoebus, describe the process

active transport, uses energy, an extension of the cytoplasm engulfs the particle and pulls it intom the cell.

how do yeast or unicellar fungi play an inportant role for larger organisms

breaking down complex nutrients which makes them avaialablle for other organisms.

Cells almost always have salts, sugars, proteins and other molecules that cause cells to be

hypertonic to fresh water

Cells communicate using what

in large organism communicate by means of chemical signals that are passed from one cell to another.

What part of the cell does active transport take place

membrane and protein pumps facilitate the transport of molecules, ions and proteins

Phagocytosis

process in which extensions of cytoplasm surround and engulf large particles and take them into the cell

An isotonic solution state it:

retains it's normal shape, does not experience osmosis

An Hypertonic solution causes a plant to

shrink and wilt

what has happened when a cell becomes Isotonic

the concentration of solutes is the same same inside and outside the cell. Water molecules move equally in both directions

large molecules cant pass through the pumps they must move side to side through vesicles

the contents of the vesicles are forced out of the cell.

a group of cells that perform a particular function is

tissues

What is the job of cell receptor

what the chemicals sent from the signaling molecule bind to.

Explain homeostasis

which is to mainatain a constant internal chemical and physical conditions .

Explain a celluar junction function

Some celluar junctions hold cell firmly together, others perform chemical connections. Others junctions allow small molecules carrying chemical messages.