The skin(leather) is the biggest organ of the body, covers it completely, takes charge protecting his(her,your) internal fabrics. It(he,she) constitutes near 10 % of the corporal weight.
It is composed of three principal caps. A superficial cap without blood irrigation, named epidermis. An irrigated cap and of connective fabric which is called dermis. And a cap hospitalizes(sends inland) of adipose and connective fabric that calls hipodermis.
The epidermis is the first cap of the skin(leather). It(she) is formed(trained) by four subcaps that depend on the characteristics of the queratocitos (basic cells of the skin(leather)).
It(She) is thicker(bulkier) in certain areas as(like) in the palm of the hands and plants(floors) of the feet. The cells of the epidermis change constant between 12 and 14 days. The most external subcap of the epidermis is the horny layer that it(he) is formed(trained) by cells queratinizadas biological inactive that have the very dense packed one.
The dermis, which also is a thick(bulky) cap, possesses a great quantity of innervaciones, these it is inserted in the epidermis by means of projections of collagen and fibers of reticulina and elastina.
The blood glasses of the dermis give him(her) his(her,your) typical color to the skin(leather) and in addition they play an important paper(role) in the thermal regulation and in the absorption of toxins for cutaneous exhibition.
The nails, the hair and the glands, dependences of the skin(leather), are modifications of epidermal cells inside the dermis.
The nail is a very thick(bulky) modification of the epidermis, grows totally in approximately three months. The hair is present in almost the whole body and is projected towards the interior of the dermis, There are approximately 100,000 hairs in the skin(leather) that they grow to a speed of 0.37 mm / day. The sebaceous glands are small glands dermales that lubricate the skin(leather). The glands sudoríferas also are in the cap dermal and take charge of the production of the sweat by means of which some substances are eliminated, between(among) them the chloride of sodium and certain metals as the copper, the zinc, the iron, the lead, cadmium and nickel. The electrolytes lost in a day of high perspiration have to of be replacing immediately.

VIDEO OF EXCRETOR APPARATUS

Excretor apparatus

Definition of excretor apparatus:

When we speak about excretion, always we think about the elimination of products of waste.

This one nevertheless, it is only one of his(her,your) functions. The excretion is in addition, a

regulatory system of the internal way, that is to say, determines the quantity of water and of

you go out that it(he,she) is in the organism(organisation) in every moment, and he(she) expels

the excess from them so that there is kept constant the chemical composition and the volume of

the internal way (homeostasis). This way it is like like the alive(vivacious) organisms

(organisations) they assure his(her,your) survival opposite to the environmental variations.

It is possible to say, that the excretion carried out by the devices excretores implies several

processes: The excretion of the products of waste of the cellular metabolism. The

osmorregulación or regulation of the osmotic pressure. The ionoregulación or regulation of the

ions of the internal way.

This is a picture of the excretor apparatus.

Urinary system

This is a picture of the urinary system.

The urinary system includes the kidneys, bladder and tubes. These organs control the amount of water and salts that are absorbed back into the blood and what is taken out as waste. This system also acts as a filtering mechanism for the blood.

The circulatory system

This is a picture of the circulatory system.

The circulatory system is made up of the vessels and the muscles that help and control the flow of the blood around the body. This process is called circulation. The main parts of the system are the heart, arteries, capillaries and veins.
As blood begins to circulate, it leaves the heart from the left ventricle and goes into the aorta. The aorta is the largest artery in the body. The blood leaving the aorta is full of oxigen. This is important for the cells in the brain and the body to do their work. The oxygen rich blood travels throughout the body in its system of arteries into the smallest arterioles.

the phases of respiration

Picture of he expiration
In the expiration the leaves the lungs.
Picture of the inspiration.


During the inspiration the air enters in the lungs.

Respiratory System

This is a picture about the respiratory system.

What is a cell?

Cells

-Definition of cell:a is the smallest part of any living thing.

-Parts of the cells:

Cell Membrane - forms the outer boundary of the cell and allows only certain materials to move into or out of the cell
Cytoplasm - a gel-like material inside the cell; it contains water and nutrients for the cell
Nucleus - directs the activity of a cell; it contains chromosomes with the DNA
Nuclear Membrane - separates the nucleus from the cytoplasm
Endoplasmic Reticulum - moves materials around in the cell
Ribosomes - make protein for the cell
Golgi Bodies - are used for packaging and secreting of energy
Mitochondria - break down food and release energy to the cell
Lysosomes - are chemicals used to digest waste
Vacuoles - are storage areas for the cell
Some organelles are found only in Plant cells. These organelles are
Cell Wall - provides structure to the plant cell
Chloroplasts - contain chlorophyll that is make food for the plant cell

Tissues

Tissue in animals

Epitherial tissue- Tissues composed of layers of cells that cover organ surfaces such as surface of the skin and inner lining of digestive tract: the tissues that serve for protection, secretion, and absorption

Connective tissue-As the name suggests, connective tissue holds everything together. Connective tissue is characterized by the separation of the cells by an inorganic material, which is called extracellular matrix. Bone and blood are connective tissues

Muscle tissue-Muscle cells contain contractile filaments that move past each other and change the size of the cell. Muscle tissue also is separated into three distinct categories: visceral or smooth muscle, which is found in the inner linings of organs; skeletal muscle, which is found attached to bone in order for mobility to take place; and cardiac muscle which is found in the heart

Nervous- Cells forming the brain, spinal cord and peripheral nervous system.

Circulatory System

The circulatory system is formed by:
-Heart
-Blod vessels (arteries,veins,capillaries)

This is a photo of a circulatory system.

What the human body is made of

Our body is made up of apparatus and systems.
Each apparatus or system is made up of several organs.

Each organ, in turn, is made up of tissues. And the tissues are formed by cells.This photo shows blood red cells in one of the veins of the liver.