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Related Concept Videos

Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
Reliability and Validity01:29

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.

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Fluorimetric Techniques for the Assessment of Sperm Membranes
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Fluorimetric Techniques for the Assessment of Sperm Membranes

Published on: November 28, 2018

Fecundability and coital frequency.

J C Barrett

    Population Studies
    |November 11, 2011
    PubMed
    Summary
    This summary is machine-generated.

    This study refines conception risk analysis across the menstrual cycle by incorporating wife

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    Published on: December 25, 2016

    Area of Science:

    • Reproductive biology
    • Human fertility studies
    • Demographic research

    Background:

    • Previous analysis (Population Studies, 1969) assessed conception risk by menstrual cycle day.
    • The influence of wife's age on conception risk was not previously detailed.

    Purpose of the Study:

    • To extend prior research by analyzing conception risk.
    • To incorporate the factor of wife's age into menstrual cycle conception risk models.
    • To develop a mathematical model for natural fecundability.

    Main Methods:

    • Data collected from 241 couples with at least one child, not using contraception.
    • Recorded basal body temperatures and frequency of coitus.
    • Statistical analysis to estimate conception risk based on cycle day and wife's age.

    Main Results:

    • Conception risk varies significantly across the menstrual cycle.
    • Wife's age is a quantifiable factor influencing conception probability.
    • A mathematical formula was proposed to link natural fecundability with coital frequency.

    Conclusions:

    • Conception risk is age-dependent and varies cyclically.
    • The proposed mathematical model offers insights into natural fertility.
    • Further research can utilize these findings for family planning and fertility studies.