___Impotence means that a male cannot product \"normal\" or \"physiologically ac
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___Impotence means that a male cannot product "normal" or "physiologically active" spermatozoa ___ Maternal blood actually mixes directly with fetal blood within the placenta during nutrient exchange. ___ Both males & females can achieve multiple orgasms if sexual stimulation is maintained or continued beyond the initial orgasm. ___ Ovulated oocytes secrete allurin which functions as a chemotaxic attractant for spermatozoa. ___ Females, like males, continue to produce new gametes throughout life - just far less numbers of them. ___ In Prophase I of Meiosis, homologous chromosome pairs line up and can exchange large pieces of DNA in a process called "crossing-over" that increases the variability of gametes ___ Humans are the only species that use sexual intercourse for more than the production of offspring. ___ Penetration of the oocyte by a sperm cell results immediately in a "wave of depolarization" the spreads around the oocyte knocking off any other spermatozoa-this is called a "Fast Block" to polyspermy. ___ A developing female fetus retains mesonephric tubules (Wolffian ducts) for her reproductive ducts ___ Pregnancy is maintained initially by hCG (human chorionic gonadotropin) keeping the Corpus viable and actively secreting progesterone until the placenta can take over. ___ The largest component of semen is the nutrient secretion (fructose, etc.) from the seminal vesicles. ___ Ovulation results from a mid-cycle surge of FSH (Follicle Stimulating Hormone) ___ PSNS mediated release of nitric oxide causes an increase in blood flow into corpus cavernosa bodies within the shaft of the penis creating pressure that essentially closes off venous drainage and makes the penis rigid or ___ A female oocyte remains in a stale of "suspended animation" (stuck in Metaphase II) and will not finish the process of Meiosis unless fertilized by a sperm. ___ In order to survive, a developing embryo must digest its way into the endometrial lining of the uterus in a process called Implantation ___ The external genitalia of both genders is identical for almost the first trimester of development. ___ The processes of Capacitation that begins in the epididymis "teaches" sperm to behave like sperm ___ Circumcision is simply the surgical removal of the foreskin (prepuce) from the glans penis. ___ The process of Meiosis produces 4 haploid daughter cells that are exactly genetically identical. ___The Cremaster muscle in spermatic cords & the Dartos muscle in the wall of the scrotum play a critical role in maintaining a cooler temperature in the testes for appropriate spermatogenesis.Explanation / Answer
1.Impotence is a condition where males lack the ability to achieve or maintain erection of reproductive organ or where fails to ejaculate. Impotence can result from excessive stress, unhealthier life style, etc.Failing to produce sperm is termed as azospermia.
2.Maternal blood dosenot mixes with fetal blood during nutrient exchange. Fetal is seperated in placenta. Blood is mixed only at the time of birth when placenta seperates.
3. Yes both male and female can have multiple orgasms( sexual pleasure). Here Orgasm occur rapidly one after another if stimulation is maintained or continued.
4. Allurin a sperm chemoattractant is realeased from ovulated oocyte for the purpuse of fertilization. It guides the sperm to find the oocyte.
5. Females dosenot produce gametes through out the life .At certain age they give up oogenesis. In human this phase is called menopause.
6.In prophase-I ( more distinctly pachytene stage)of meiosis crosssiong over occur. Two homologus chromosome fuse that is called synapsis and crossing over takes place.It results in genetic variation.
7.Yes we humans use sexual intercourse more than producing offspring. The purpuse of reproduction is to produce offspring and that is the characteristicof life.
8. yes when a sperm first enters a oocyte fast block of polyspermy takes place with in secoends to ensure that no more sperm enters the oocyte thus maintaining species chromosome number.it is achieved by depolarization of the egg membrane.
9. No wolffian structures are found in developing male fetus. These are urogenital structures which give rise to epididymis, vas deferens and seminsl vesicles.
10.Yes Human Chorionic Gonodotropin takes care of the fertilized egg and corpus luteum. It is produced by placenta after implantation.
11. Yes the nutrient section including fructose promote survival of spermatozoa nad provides the environment allowing the movement.
12. No ovulation results from surge of LH(leutinizing hormone). then oocyte is released into the uterine tube. FSH accounts for estrogeen and progesterone production.
13. Yes corpus cavernosa expand to give erection by the release of nitric oxide .
14. yes female oocyte completes its meiosis after fertilization by releasing polar body.meiosis is delayed.
15.Yes developing embryo gets implanted into the endometrium layer of uterus to survive and gets its necessary ingredients to survive.
16.yes Ist trimester is the embryo stage . here male and female cannot be identified .
17.yes sperm capacitation is the maturation of sperm in epididymis to make sperm capable of fertilization
18.yes. circumcision is the removal of the fore skin from human reproductive structure..
19.No daughter cells produced by meiosis are not genetically identical in males. examples we produce 2 types of sperm cells that are not genitacilly identical (22A+X) and (22A+Y).
20.yes. the cremaster and dartos muscle both works in temeperature regulation in testes by expanding and contracting.
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