Ovulation...?

Question

What is the difference between primary oocytes, secondary oocytes, and mature ova?

Answer 1

1.primary oocytes
- diploid (2 complete sets of chromosomes)
- 'formed' from oogonia during the process of oogenesis
* primordial follicles consist of a primary oocyte + a single layer of squamous follicle cells
* primary follicles consist of a primary oocyte + 1/several layers of cuboidal follicle cells

2. secondary oocytes
- haploid (1 complete set of chromosomes)
- developed from the primary oocyte undergoing meiosis I to form a secondary oocyte + a tiny first polar body
* found in the matured Graafian follicle
* begins meiosis II & stops at metaphase II upon ovulation & only continues upon fertilisation

3. mature ova
- haploid
consists of:
secondary oocyte
corona radiata (surrounding secondary oocyte)
cortical granules (found below plasma membrane of SO)
zona pellucida (glycoprotein jelly coat just outside secondary oocute)
* stops at metaphase II until fertilisation

Answer 2

An oocyte, ovocyte, or rarely oöcyte is a female gametocyte or germ cell involved in reproduction.The formation of an oocyte is called oocytogenesis. Thus, oocytogenesis is a form of gametocytogenesis whose male counterpart is spermatocytogenesis. Oocytogenesis results in the formation of both primary oocytes before birth, and of secondary oocytes after it as part of ovulation.

- The division of an oogonium by mitosis creates two diploid primary oocytes which are kept in a prolonged prophase I, known as the Dictyate stage, ready to continue meiosis when puberty begins.
- As part of ovulation, primary oocytes undergo the first meiotic division, which sees homologous chromosomes pair during prophase and split from one another during anaphase. This forms one haploid secondary oocyte and the first polar body.
- A second period of arrested development occurs after the first meiotic division forms the secondary oocyte. The egg may be expelled from the ovary in this condition, and in many species, including humans, the second meiotic division is not completed until the egg is fertilized by a sperm.
- The oocyte divides in meiosis II into one ootid and the second polar body. The ootid then differentiates into an ovum.

Answer 3

The oocytes are at different stages in oocytogenesis, from earliest to more mature, obviously. Primary oocytes have 46 chromosomes, while secondary oocytes have 23. The primary oocytes begin meiosis but are arrested at the diplotene state until ovulation at puberty to give rise to haploid secondary oocytes or ova. Therefore, the secondary oocytes, egg cells, are part of ovulation.
If you need more info, this site explains it well:
http://www.embryology.ch/anglais/dbefruchtung/eisprung02.html

Answer 4

Sounds like you're having sex at exactly the right time. I was using a generic brand ovulation kit, and it was positive for three or four days as well, which was confusing. So I switched to a ClearBlue digital ovulation test. It shows an empty circle if you're not ovulating, and a happyface if you are :) It was much less confusing. For the second part of your question, I don't know if it's important to have sex everyday. My hubby and I tried to because we figured, the more chances the better! Some people say every other day though. Good luck. :D

Answer 5

Ovulation is the process in the menstrual cycle by which a mature ovarian follicle ruptures and discharges an ovum (also known as an oocyte, female gamete, or casually, an egg) that participates in reproduction. Ovulation also occurs in the estrous cycle of other animals, which differs in many fundamental ways to the menstrual cycle.

The process of ovulation is controlled by the hypothalamus of the brain and through the release of hormones secreted in the anterior lobe of the pituitary gland, (LH and FSH). In the follicular (pre-ovulatory) phase of the menstrual cycle, the ovarian follicle will undergo a series of transformations called cumulus expansion, this is stimulated by the secretion of FSH. After this is done, a hole called the stigma will form in the follicle, and the ovum will leave the follicle through this hole. This release of ovum, ovulation is triggered by a spike in the amount of FSH and LH released from the pituitary gland. During the luteal (post-ovulatory) phase, the ovum will travel through the fallopian tubes toward the uterus, implanting there 6-12 days later if fertilized, or degrading in the fallopian tubes within 24 hours if not fertilized.

In humans, the few days near ovulation constitute the fertile phase. The average time of ovulation is the fourteenth day of an average length (twenty-eight day) menstrual cycle. It is normal and common for the day of ovulation to vary from the average, however.

Cycle length alone is not a reliable indicator of the day of ovulation. While in general an earlier ovulation will result in a shorter menstrual cycle, and vice versa, the luteal (post-ovulatory) phase of the menstrual cycle may vary by up to a week between women.

Strictly defined, the ovulatory phase spans the period of hormonal elevation in the menstrual cycle. The process requires a maximum of thirty-six hours to complete, and it is arbitrarily separated into three phases: periovulatory, ovulatory, and postovulatory

Designed by a woman in consultation with women physicians, Ovulation Calendar is a program that calculates the time of ovulation and generates your personal fertility calendar. Simply enter the length of your menstrual cycle and the date of your last period, and Ovulation Calendar will calculate your fertile days. The results are presented as a color-coded calendar showing your fertile and non-fertile periods.


etc

Answer 6

Primary Oocyte

Answer 7

Primary means they are young, secondary means they are at that age where they become annoying, and mature ones start to forget stuff and have a limp.

Answer 8

young, old, elderly