Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The male reproductive system includes testes, which are extra-abdominal located in the scrotum to maintain a temperature lower than the internal body temperature for .
Spermatogenesis is the process of forming haploid sperm from diploid spermatogonia. This involves cells for nutrition and cells for the secretion of .
Oogenesis is the formation of a haploid ovum. It initiates during the fetal stage, remains arrested at until puberty, and completes only upon fertilization by a sperm.
The Menstrual Cycle consists of the Menstrual phase, Follicular phase (proliferative), Ovulatory phase ( surge on day ), and Luteal phase (secretory).
Fertilization occurs at the of the Fallopian tube. The acrosome of the sperm releases enzymes like to penetrate the .
The stage is responsible for implantation in the . It consists of an outer and an .
The acts as an endocrine tissue, secreting (human Chorionic Gonadotropin), (human Placental Lactogen), , and .
Parturition is a neuroendocrine mechanism triggered by the , leading to the release of from the maternal posterior pituitary.
📐Formulae
patterns
💡Examples
Problem 1:
Calculate the number of primary oocytes and primary spermatocytes required to produce eggs and sperm cells respectively.
Solution:
primary oocytes and primary spermatocytes.
Explanation:
In oogenesis, one primary oocyte undergoes meiosis to produce only functional ovum and polar bodies. Thus, oocytes produce eggs. In spermatogenesis, one primary spermatocyte undergoes meiosis to produce functional spermatozoa . Therefore, spermatocytes are required.
Problem 2:
Explain the significance of the surge in the menstrual cycle.
Solution:
The surge triggers .
Explanation:
Rapid secretion of Luteinizing Hormone () leading to its maximum concentration during the mid-cycle (around day ) is called the surge. It induces the rupture of the and the release of the secondary oocyte into the pelvic cavity.
Problem 3:
A zygote is found to have chromosomes. Determine the sex of the child and the contribution from the parents.
Solution:
The sex is Female. Both parents contributed an chromosome.
Explanation:
The sex determination in humans is type. A zygote with develops into a female. Since the mother always contributes an chromosome in the ovum , the sperm must have also carried an chromosome to result in .