REPRODUCTIV CHAPTER 19 1. Where does successful fertilization occur? a, in the u
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REPRODUCTIV CHAPTER 19 1. Where does successful fertilization occur? a, in the uterus in the uterine tubes c, in the ovaries d, in the endometrium 2. The releases a hormone that target the endometrium. It causes the endometrium to thicken and therefore prepare for the implantation of the fertilized egg. What is the name of that hormone? a. follicle stimulating hormone b. luteinizing hormone progesterone d. human chorionic gonadotropin 3. The corpus luteum normally stops functioning about ten days after at least 2 in the presence of a fertilized egg. it will continue to function for months. There is a hormone that causes it to continue functioning. What is the name of that hormone and where does it come from? a human chorionic gonadotropin adenohypophysis progesterone corpus luteum human chorionic gonadotropin zygote progesterone endometrium What hormone ultimately causes the formation of a corpus luteum? a. progesterone b. follicle stimulating hormone c. luteinizing hormone human chorionic gonadotropin 5. What hormone ultimately causes ovulation? a. progesterone follicle stimulating hormone c. luteinizing hormone d. human chorionic gonadotropin 279Explanation / Answer
Q1 - Correct answer is (b) uterine tube or fallopian tube is place where successful fertilization occurs.
Q2 - Correct answer is (c) Progesterone
Q3 - Correct answer is (c) Human chorionic gonadotropin release from the zygote helps maintain the corpus luteum.
Q4 - Correct answer is (c) - During ovulation, increase in the level of LH (luteinizing hormone) causes the dominant follicle in the ovary to releases an ovocyte/ovum while the remains of the dominant follicle in the ovary become a corpus luteum. If the ovum or egg is fertilized, this corpus luteum is maintained by the HCG (Human chorionic gonadotropin).
Q5 - Correct answer is (c) Luteinizing hormone (LH) in an event known as the LH surge which happens around 14th day of the menstrual cycle leading to ovulation.
Q6 - Correct answer is HCG (Human chorionic gonadotropin) because this hormone is released by the zygote itself and hence its presence confirms pregnancy.
Q7 - Plural form is "testes".
Q8 - Menopause occurs when the ovaries stop functioning and no longer produce eggs/ovum. It can be determined by the excess presence of FSH (Follicular stimulating hormone) and a lack of the estrogen. The depletion of the ovarian reserve causes an increase in the levels of circulating FSH as there are fewer eggs and follicles responding to these hormones and producing estrogen. Hence, estrogen levels also fall significantly.
Q9 - The flow of the sperm from the male reproductive system to the female uterus happens via a sequence of steps which are stated as follows:
Sperms/Spermatozoa are produced within the seminiferous tubules present in the testes. These sperms are then transported via epidydimis, which is a long tube that wraps around the testes and acts as a sperm storage area. Passing through the epidydimis delays the release of sperm and gives it time to mature. From the epidydimis, sperms are carried into the abdominal cavity via a muscular tube called the vas/ductus deferens to the ejaculatory duct. Within this duct, sperm gets mixed with semen and passes onto urethra, from where its is expelled from the body during ejaculation into the female uterus via the primary male sexual organ. The entry of the male sexual organ happens via cervix which forms the entry to the uterus. Once the sperms are inside the uterus, they move and fuse with the female egg/ovum. This process is called fertilization and typically happens in the fallopian tubes/uterine tubes.
Thus the correct sequence is
Seminiferous tubules > Epidydimis > ductus deferens > Penile urethra > Uterine cervix > Uterus > Uterine tubes
G > A > C > F > B > D > H
Since the fertilization occurs in the tubes, the sperm never enters the ovaries and hence it is not part of this sequence.
Q10 - In the question, it is mentioned that a gamete undergoes a process of meiosis. This is never the case. Gametes are haploid and are the products of meiosis and contain half the number of chromosomes present in the diploid parent.
If the diploid parent (2n) has 60 chromosomes and it undergoes meiosis, then each daughter cell would have 30 chromosomes each, because meiosis is a kind of reduction division creating 4 haploid cells from a diploid parent. But if the question states that a gamete undergoes meiosis,then probably the question is wrong as a gamete can not undergo any further division.
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