Genes.
Whether you are naturally tall or small, blond or brown haired, blue or green eyed, left or right handed; depends largely on the genes in your body cells.
A gene is a part of one of the chromosome threads inside the nucleus of each cell, those control the characteristics which are passed on from parents o their children.
When an egg is fertilized two sets of genes are put together, one set comes from the father in the sperms chromosomes and the other set from the mother in the egg´s chromosomes. Each carries half of the total instructions for the new human. Those genes passed carry instructions about body characteristics like height, hair color and eye color.
Dominant genes: the genes with ´´stronger ´´ or dominant instructions will control happens.
Heredity: is the passing on of characteristics from one generation to the next.
Chromosomes: are fine threads of material for carry instructions. There are 10.000 genes on each chromosome.
Human cells have 46 chromosomes. Sperm and eggs have only half that number. When a sperm and eggs join a new being begins to grow.


The three man stages of cells division.
First stage: Each chromosome makes an exact copy of itself.
The copies separate one chromosome from each pair goes to opposite sides of the cell.
Third stage: The cell divides. New nuclei form. Each daughter cell has the same chromosomes as the parent.

Baby: the first nine months.
WE used to thinking of a baby being age 0 on the day it is born. But it has been growing for about nine months before it enters the world. This is what happens in the nine month (38 weeks) before is born.
Week 0--- egg is fertilized in the tube.
Week 1---- Embryo becomes attached to the womb.
Week 2----Embryo´s eyes being to develop. Its legs and arms are tiny bumps.
Week 6----Embryo begins to look like a human. Ears, hands and feet begin to grow, heart begins to beat.
Week 10---Baby´s finger and toes grown .It can move its arms and legs a little, it can even swallow.
Week 14---If doctors could see the baby, they could tell if it was boy or a girl.
Week 18---Baby has hair .eyebrows. Doctors can hear its heart beat. It can move…mother begins to feel its kicks.
Week 26---Baby opens its eyes.
Week 30--- If born now, the baby could live with special care.
Week 34---Bay has grown a lot of fat in the last four weeks, to keep it warm when it is born.
Week 38---Baby is born.

1. Where is an egg:
A) Produced:in the ovary.
B) Fertilised:Fallopian tube tubes.

2. When the body is in the womb:
a) How does it get food and oxygen?by the umbilical cord.
b) How is it protected? by the placenta.
3. What are contractions?A contraction is when your uterus tightens and sqeezes the baby, this results in your cervix dilating so your baby can come down the birth canal.

4. How is a baby born? it can be by cesary or by normaly born.
5. Why does the growing embryo depend on the cord? causwee it gives to it the food and the oxygen,nutrients and everything it needs.
6. Why can the cord be safely cut once the baby is born? ´cause now the baby can breathe for himself and don't need more the cord.
7. Is a woman begins to release eggs at the age of 15, and stops releasing them at 45, how many eggs will she produce? she produce like 1.540 in 45 years.
8. Try to find out:
-What special foods a mother to be should have in her diet, and why? she needs the basical alimentary .fish,eggs,milk,juice.because she need to give the apropiate nutries to the baby.

CELL IN THE INTESTINE:

Intestine cell: cell which take in or absorb food.
Fat cell: cells which store food.
Nerve cell: cells which carry messages round the body.
Red blood cell: cells which carry chemicals round your body.
Cells in the nose: cells which allow chemicals to pass through channels between them.
Cells in the wall of a blood capillary: cell with tiny hairs which more liquids over their surface.

Fertilisation.

Has to take place before a new animal can grow .The sperm and the egg join up, making a fertilised egg.The new animal grows from this fertilised egg which divides,producing more and more cells.

¿Qué sucede con la presión si aplicamos calor? Para dar respuesta a esta pregunta, observemos lo que sucede en el experimento de la botella plástica. Cuando aplicamos calor a la botella, calor que viene desde nuestras manos, observamos que la moneda sobre la boca de la botella, de un momento a otro, salta. Este fenómeno nos sugiere que, al aplicar calor al gas, este aumentó su presión, de modo que en la boca de la botella se produjo una diferencia de presión (valores diferentes de la presión entre dos puntos del espacio), que se traduce en una fuerza neta hacia arriba que hace saltar la moneda.
Publicado por LAURA en 10:58 0 comentarios

1. Con el clavo y el martillo realizamos un agujero en la tapa del bote de cristal. Cuidado con el martillo.2. Metemos la cañita tal como vemos en la imagen.3. Llenamos de agua el tarro (unos dos cm) y colocamos la tapa. Es importante que no entre aire en el tarro. Ponemos pegamento en la unión de la cañita con el agujero de la tapa y, si es necesario, podemos sellar la tapa del bote con cinta aislante.4. Rodeamos el bote con nuestras manos.Vemos que sube agua por la cañita.Explicación:La temperatura de nuestro cuerpo es superior a la temperatura del frasco de cristal.Al rodear el bote con nuestras manos, suministramos energía al frasco de cristal y aumenta la temperatura del aire en el interior del frasco. Dicho aumento de temperatura produce un aumento de la presión en el interior del frasco que empuja el líquido que sube por la cañita.Si abrimos la tapadera del frasco, la presión en el interior recupera su valor original y el líquido que sube por la cañita cae al frasco.

Reproduction in Animals.

only the simplest animals reproduce by dividing in two.Most animals including humans,produce special sex cells for reproduction.

there are usually two types of sex cells.the smaller of the two can move on its own.It is called the male cell or sperm.The longer one can not move on its own .its called the female cell or egg.

Human sex cells and Human reproductive organs.