The organisation of living things (Unicellular and multicellular…
The organisation of living things
The characteristics of living things
Nutrition: this rule consits of transform the food that we eat into nutrients an get energy from these.
Interaction: is the abillity to sense changes in the enviroment; and react to them.
Reproduction: enables living things to produce offspring similar to themselves.
The size of living things
Macroscopic things: are the living things that we can see with the naked eye.
Microscopic things or microorganism: are the living things that we can,t see with the naked eye, we need a microscope to see him.
All living things are made of cells. A cell its the smallest unit of life. Its a living thing,because it perform the three vital function.
These are two types of cells:
Cytoplasm: it is a viscous liquid wich the organelles float in.
The cell membrane: is the outher shell of the cell;takes part in the interaction function.
Nucleus: controls the cell and have the necessary material to reproduce it.
The organelles:perform various cells function; such as manufacturing.
The cell wall:is a rigid structure that sorrounds and protect the cell.
Membrane:separated the nucleus from the cytoplasm.
Chloroplasts: are green organelles that capture light and produce nutrients.
Unicellular and multicellular organisms
Living things that are composed of a single cell. Their single cell performs all the functions needed to live.
Living things that are composed of two or more cells .In these living things all the cells are arranged.
In multicelular organism, cells are grouped to form different levels of organisation:
Cells: are the first levels of organisation.
Tissue: a group of cells wich perform the same function.
Organs. a group of tissues wich perform the same function.
System:a group of organs that work together.
Types of cells:
Muscle cells; these cells are enlongated,these cells expand and contract. These allows muscles to move.
Epithelial cells: these cells insulate the body and protect it.
Nerve cells: These cells establish connections and then transmit information to all the body .