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 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 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 […]
Hi This section is sooo long and so I cannot put it in one post unfortunately. DEFINITIONS: Urethra: Conducts sperm Penis: Sex organ for copulation Epididymis: Stores and matures sperm Vas deferens: Sperm ducts (transports) Seminal vesicles, prostate gland, Cowper’s gland: Contributes fluid to semen Fallopian tubes: Conduct eggs and are the location of fertilisation […]
Hi DEFINITIONS: Courtship: Behaviour that is designed to attract another animal for mating and breeding External fertilisation: Sperm is deposited outside the female’s body Internal fertilisation: Sperm is deposited inside the female’s body Ovipary: Strategy where animals lay eggs that often have many offspring e.g. frogs Ovovivipary: Like in snakes- a strategy where the animal […]
Oh Gosh My Grades 