Which structures are involved in the production of semen? At birth, the female o
ID: 3166960 • Letter: W
Question
Which structures are involved in the production of semen?
At birth, the female ovaries have about one million follicles each. Although the follicles start meiosis, their division is stopped part way through the cycle and the follicles are stored. At what point in the meiotic cycle are the follicles stored.
What are the four extra embryonic membranes? Which of these membranes contributes the blood vessels that go on to become the umbilical cord in mammals?
What is meant by the term “allometric growth?”
Be prepared to:
explain the two phases of the menstrual cycle as they relate to ovulation and the secretion of hormones.
discuss the major stages of fetal development that occur during each trimester of pregnancy.
Explanation / Answer
1) The testes are the male gonads. testes generate sperm, the male sex cells and other sex hormones. seminiferous tubules generate spermatogonia cells. These cells, divide into spermatocytes and then become spermatids. The process is called spermatogenesis. Spermatids move from the testis to the epididymis and mature into sperm.
Sperm cells depend on the seminal fluid to keep them alive. This fluid is produced by accessory glands: the seminal vesicles, the prostate, and the bulbourethral glands (Cowper's gland).
2) Oogenesis, in the human female reproductive system, is a growth process in which the primary egg cell (ovum) becomes a mature ovum. this oogonium enters into first meiotic division and these produced cell called primary oocytes. this primary oocyte progress in meiotic cycle up to diplotene stage of Prophase 1.
3) 4 membranes are- amnion, yolk sac, chorion, and allantois.
aminion - innermost fold of inner ectoderm and outer mesoderm above the embryo. amniotic cavity is present between the amnion and embryo, filled with amniotic fluid. Amnion protects the embryo while amniotic fluid acts as a shock absorber.
yolk sac - inner endoderm and outer mesoderm and are well developed in reptiles and birds.
allantois - stores metabolic wastes.
chorion - this extraembryonic membranes form a placenta and umbilical cord, which connect the embryo to the mother's uterus. placenta extracts food and oxygen from the uterus and Carbon dioxide and other wastes are transferred to the mother for excretion.
4) In an organism various organs are present and they have the different rate of growth. this different rate of growth of organs is called allometric growth.
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