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- The olfactory pits form from which of the following? mesoderm cartilage ectoderm endodermWhat would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Tire cells would not continue to divide. Tire corpus luteum would continue to produce progesterone and estrogen. Menses would flush the blastocyst out of the uterus. Tire uterine mucosa would not envelop the blastocyst.QUESTION 2 When does gastrulation in humans begin? Once the endoderm, ectoderm, and mesoderm have formed Once implantation is complete and the extraembryonic membranes have formed When the blastocyst reaches the uterus When the inner cell mass starts to differentiate O O 0 O
- There are 5 primary oocytes that will undergo cell division, How many functional egg cells will be viable for fertilization?SOME EVENTS IN THE PROCESS OF FERTILIZATION 1. A single sperm nucleus and an egg nucleus fuse to form a zygote. 2. Many sperm cells travel a path through the outer layer of the egg cell. 3. The egg's plasma membrane is penetrated by a sperm cell. 4. A rapid depolarization of the egg plasma membrane occurs. The correct sequence to complete the fertilization of the egg is , , andQuestion 6 Which is true about oogenesis? a. The process of oogenesis occurs in the uterus Ob. The process begins with primitive stem cells called microglia Oc. They become encapsulated in tissue and form the ridges in the uterus O All of the choices are correct O None of the choices are correct uring spermatogenesis.
- Question 7 osis II after fertilization. Which of the following changes is most likely to occur as an immediate result of an injection of LH into a male mammal? O an increase in production of GnRH a decrease in production of testosterone O an increase in production of testosterone O a decrease in production of inhibin Question 8 Which option correctly lists, in chronological order, the three phases of the human ovarian cycle? O follicular phase → ovulation → luteal phase menstruation → proliferative phase → secretory phase phore → secretory phaseQUESTION 4 Which of the following is the best description of how pregnancy most often occurs? Sperm enter the body through the urethra, then travel to the uterus where fertilization occurs O Sperm enter the body through the urethra, then travel to the Fallopian tubes where fertilization occurs Sperm enter the body through the urethra, then travel to the ovaries where fertilization occurs Sperm enter the body through the vagina, then travel to the uterus where fertilization occurs Sperm enter the body through the vagina, then travel to the Fallopian tubes where fertilization occurs Sperm enter the body through the vagina, then travel to the ovaries where fertilization occurs O O O 0 O OQuestion 11 10. In the center of the embryo sac are the: ovules. synergids. eggs. O polar nuclei. O antipodals.
- Stages in Embryonic Development 1. The heart begins to beat. 2. Inner cell mass differentiates into three germ layers. 3. Mitosis leads to a 100-cell mass. 4. Implantation occurs in the endometrium. The embryonic developments listed above occur in the sequence andQUESTION 52 What process takes the single-celled zygote and turns it into a multicellular embryo? Gastrulation Fertilization Cleavage Neurulation Organogenesis.Question 1 of 5 Which of the following findings would be expected in a 20-week-old fetus? Select all that apply. Skin is less transparent in appearance. Skin is covered in vernix and lanugo. O Palate has just fused. Blastocyst is beginning the process of implantation. Sex is easily determined.