A child is born

Hi,

Swedish photographer, Lennart Nilsson, spent 12 years of his life taking pictures of the foetus developing in the womb. These incredible photographs were taken with conventional cameras with macro lenses, an endoscope and scanning electron microscope. Nilsson used a magnification of hundreds of thousands and worked right in the womb. His first photo of the human foetus was taken in 1965.

6 months.
There are still 8-10 weeks ahead, so the little human is getting ready to leave the uterus. It turns upside down because it will be easier to be born this way

26 weeks

20 weeks: Approximately 20 cm. Woolly hair, known as lanugo, covers the entire head

19 weeks

8 weeks: Approximately 14 cm. The foetus can now perceive sounds from the outside world

The skeleton consists mainly of flexible cartilage.
A network of blood vessels is visible through the thin skin.

16 weeks.
The foetus uses its hands to explore its own body and its surroundings.

10 weeks.
The eyelids are semi-shut. They will close completely in a few days.

Eight weeks.
The rapidly-growing embryo is well protected in the foetal sac.

40 days.
Embryonic cells form the placenta. This organ connects the embryo to the uterine wall allowing nutrient uptake, waste elimination and gas exchange via the woman's blood supply.

5 weeks: Approximately 9 mm. You can now distinguish the face with holes for eyes, nostrils and mouth.

four and half weeks

four weeks

The brain starts to develop in the human embryo.

8 days.
The human embryo is attached to a wall of the uterus.

5-6 days.
The clump has developed into an embryo, containing many more cells,
and has entered the womb

The winning sperm

The fallopian tube

Will they have a date?

An egg

Sperm in the fallopian tube

The miracle of a baby!

Cheers

Lesson 10: Cell division-mitosis and meiosis

Hi,

This is a very good revision material to view. concepts covered include:

• cells divide to increase numbers for growth, repair and reproduction
  
• cell organelles-mitochondria, chloroplast, nucleus, cell membrane
• specialised cells-red blood cell, nerve cell, pollen, guard cell, palisade cell, xylem cell,
• 1 billion cells per hour are replaced in your body by cell division
• blood cells by bone marrow by mitosis
  
• skin cells 100 million per day by mitosis
  
• zygote, 1 cell, grows into baby within 9 months by mitosis
• photographs on mitosis in onion shoot and root tip showing mitosis
• meiosis- in testis, ovary, anther
• fertilisation restores the diploid number in zygote
• mitosis ( 2n--> 4n--> 2n-->2n)
• meiosis (2n--> 4n-->2n-->n)
  
• the sex of child is determined at the point of fertilisation
• fertilisation with y-carrying sperm results in male, fertilisation with x-carrying sperm results in female child.
• meiosis occurs in anther producing pollen, in testis producing sperm, in ovary producing ova, ( or ovule in plant).
  
• self fertilisation less variation than cross fertilisation in plants
• short questions
  

Mitosis and Meiosis

View more OpenOffice presentations from Dr samuel Aylward.

Cheers