3.18-3.19

circle of life

3.12 Amniotic fluid

surrounding the rest of the embryo (uterus space) the space is the amniotic fluid

- it protects the undeveloping embryo

-fluid//water

= cannot be compressed

=it will absorb any pressure and will prevent harm to the child

=absorbs any forces/ pressure from the outside wall of the uterus

3.11 Placenta

When the child is in the uterus- amniotic fluid (water filled environment- child cant breath, digest, excrete)

placenta biological grows out of the developing embryo (not out of the mother)

how does a baby obtain nutrition?

nutrition- blood vessel lead from the embryo down the umbilical cord then spread forming a placenta

- blood vessel inside the placenta are the childs including the veins and the arteries

-mother continues to eat during pregnancy- in the blood stream there would be glucose, amino acids and fats, these will travel through her blood stream into the wall of the uterus

--> the molecules will cross into the childs blood into the placenta, (amino acid, glucose, fats will enter the childs blood

-placenta has a large thin surface area

- nutrients that the child recieve comes from the mother

-child produces carbon dioxide and urea which goes to the mothers blood.

3.9b Female Reproductive System

Before a pregnancy occurs the ovary (uterus structure) is no larger then a size of orange.

Ovary-  meiosis occurring and the production of eggs (female gametes)

Oviducts- carry the eggs to the uterus

- location where fertilisation might take place --> sperm cell meeting egg cell

Uterus=

Uterus wall- made of muscle--> stretch to accomodate pregnancy and will contract during birth

Lining of the uterus-develelops the fertilised egg--> the embryo (in the wall)--> child

Cervix- entrance to the uterus

Uterus space- where the sperm cell and egg cell move, where the embryo develops into an unborn child

Vagina- where the penis is introduced here, collects the sperm cell and allow then to pass through to the cervix

3.9 Male Reproductive System

Bladder- Store urine

Testis-carry out the process of mitosis that produces the gamete called the sperm cell

Epididymis- store the sperm cell

Vas Deferens- carry sperm cells to the penis during sexual stimulation, the tube pulses contracts pushing the sperm to the penis

Prostate-adds about 20%-30% the volume of semens, containing sugars and is also alkali

Seminal vesicles-they are alkali 70% of the semen

Urethra-common tube that join the left and right testes taking the semen down the penis/exit for urine

-carry semen

-urine

Penis-  carry sperm cell into the vagina during sexual intercourse

When sperm cell are combine with the prostate and seminal vesicles secretions we have semens. these are carried forward and downwards to the urethan