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Ch. 46 - Animal Reproduction

Chapter 46, Problem 5

During human gestation, rudiments of all organs develop a. in the first trimester. b. in the second trimester. c. in the third trimester. d. during the blastocyst stage.

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Hello everyone and welcome to today's video. So in today's video we have a problem regarding development. So let's jump straight into it during the first semester when the embryo develops adult structures in rudimentary forms. It is called a blank. And so let me quickly remind you how this process of development in the uterus works chronologically. So once conception occurs, what we have is what we call a zygote and the cycle is going to undergo cell division for multiple days to then become more or less is more or less as well is going to undergo a lot of cell division constantly during those days, then become a molasses. Is and this is happening about the first week of conception, this is going to continue happening and more stages are going to come until we reach the fetal stage, which happens eight weeks after conception. Now these first three stages are all part of the embryo stage and after the embryo stage is done after the eight weeks is going to or just the baby is going to enter the fetal stage. And this happens or it continues being in the fetal stage until birth. And so as we can see, the question is asking us just fundamentally, what's coming after the embryo stage. And as we can see here in our graph is going to be the fittest stage, which is when the baby begins or the embryo begins developing adult structures in rudimentary form and just continues developing them until birth. And so that is going to be the final answer to our question and which is answer choice. A fetus. So I really hope this video helped you, and I hope to see you on the next one.
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In male mammals, excretory and reproductive systems share a. the vas deferens. b. the urethra. c. the seminal vesicle. d. the prostate.

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Which of the following is not properly paired? a. seminiferous tubule—cervix b. vas deferens—oviduct c. testosterone—estradiol d. scrotum—labia majora
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Peaks of LH and FSH production occur during a. the menstrual flow phase of the uterine cycle. b. the beginning of the follicular phase of the ovarian cycle. c. the period just before ovulation. d. the secretory phase of the uterine cycle.

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Which of the following is a true statement? a. All mammals have menstrual cycles. b. The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles. c. Estrous cycles are more frequent than menstrual cycles. d. Ovulation occurs before the endometrium thickens in estrous cycles.

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Textbook Question

For which of the following is the number the same in human males and females? a. interruptions in meiotic divisions b. functional gametes produced by meiosis c. meiotic divisions required to produce each gamete d. different cell types produced by meiosis

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Textbook Question
Which statement about human reproduction is false? a. Fertilization occurs in the oviduct. b. Spermatogenesis and oogenesis require different temperatures. c. An oocyte completes meiosis after a sperm penetrates it. d. The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
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