intercellular communication through chemical signals

1- Introduction : Intercellular communication is one of the features of multicellular organisms, provided by chemical molecules (informative or messengers molecules) issued by a ...

Methods & rsquo; cell study

Introduction : The cell is the basic structural unit and functional living organisms and because of its small size, cell biology. all...

fluid compartments

Definition of the internal environment : In human cells the different devices are surrounded by a space called intercellular space, or is a liquid ...

genital apparatus

Introduction : L'embryologie est une discipline scientifique qui englobe la description morphologique des transformations de l'œuf fécondé en organisme. L'embryologie est la science du développement....

General information on the anatomy of the human body

DEFINITIONS : -Anatomy comes from the Greek word anatomia or anatome that is to say "cut through" or "dissect". -L'anatomie est une science qui a pour objet...

Chromosomes

I- Structure of human chromosomes : Les chromosomes sont de petits organes en forme de bâtonnets constitués par de longues molécules d'ADN double brin associés...

Bohr atom

Bohr's model is based on Planck's quantum theory that the exchange of energy between radiation and matter only takes place ...

menstrual cycle and hormonal regulation

I- MENSTRUAL CYCLE : A- DEFINITION : Throughout the active genital life, l'aspect histologique de la couche superficielle « fonctionnelle » de l'endomètre...

replication

I- Introduction : During the Cell Cycle, Rejoinder cell contents and then divides into two giving : New organization in unicellular beings ...

Hand Skeleton

I- Introduction : The skeleton of the hand is formed of 3 parties : the carp: responsive to the wrist  the pastern: which forms the palm of ...