Hi Gestation is the time between conception (when sperm meets egg) and birth- during this the fetus is developing in the uterus. Early development (0-end of 2 months) Fertilisation Blastocyst and implantation formation Embryo formation Later development (3-9 months) Fetal stage EARLY DEVELOPMENT FERTILSATION Occurs in the fallopian tube Nuclei of sperm and egg fuse […]
Hi WHAT IS IT? A series of changes in the endometrium & can be divided into 3 phases: Menstrual and development of Graafian follicle (days 1-5) Building phase (days 6-14) Luteal and secretory phase (days 15-28) PHASE 1 The breakdown & shedding of the endometrium occurs as there is no progesterone to maintain the endometrium. […]
Hi The secretion of FSH & LH (from the pituitary gland) as well as the ovarian hormones (progesterone and oestrogen) is controlled by a NEGATIVE FEEDBACK MECHANISM. The signalling mechanism is the increased concentration of each hormone in the blood and this increase in one hormone will negatively affect the other. Under the influence of […]
Hi Labour includes the expulsion of the baby as well as the release of the afterbirth (placenta). One option is a CESAREAN SECTION it is in a surgical procedure where incisions are made through a woman’s abdomen and uterus to deliver her baby. WHEN DOES DELIVERY OCCUR? 280 days after her last menstruation 38 weeks […]
Hi Changed my mind, decided to try and upload a few more posts and hopefully some activities too. IMPLANTATION As the zygote moves down the oviduct, it divides by 2 by mitosis and each cell divides again. Soon there is a solid ball of cells. On about the 5th day it enters the uterus and […]
Hi Not sure yet but I am hoping that this is my last post for the night. Within the menstruation cycle there is 2 cycles- the uterine cycle and the ovarian cycle. During the first week of the cycle the pituitary gland is stimulated and FSH is released . It travels through the blood until […]
Hi Diploid germinal epithelial cells divide mitotically and give rise to diploid oogonia From puberty oogonia grow and develop into primary diploid oocyte Primary oocytes unddergo meiosis and turn into haploid secondary oocytes and the polar body is formed In the end- there are 3 polar bodies and 1 haploid ovum
Hi Excuse the terrible drawings, I had to draw them as I couldn’t find the pictures that I wanted. SPERM CELL GROWTH: There is a golgi apparatus, acrosomal vesicle as well as a spermatid nucleus The centrioles appear Microtubules and flagellum appear Excess cytoplasm disappears There is now a complete sperm cell with midpiece, head […]
Hi This is the follow-up that I promised yesterday on the male reproductive system- this will include the structure and the functions of the parts. THE STRUCTURE OF THE MALE REPRODUCTIVE SYSTEM The primary sex organ is the testes. It produces sperm and testosterone The 3 additional glands are: Seminal vesicles. They provide fructose which […]
Hi This post focuses on only the female reproductive system, the next post will probably be on the male reproductive system. STRUCTURE: OVARY Female gonad. Either of the female sexual glands in which oocytes are formed. UTERUS Hollow muscular organ in female mammals in which the blastocyte becomes embedded and the developing embryo and fetus […]
Oh Gosh My Grades 