CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
10th Edition
ISBN: 9780136538820
Author: Taylor
Publisher: INTER PEAR
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Textbook Question
Chapter 27, Problem 10TYK
After a sperm penetrates an egg, it is important that the vitelline layer separate from the egg so that it can
a. secrete important hormones.
b. enable the fertilized egg to implant in the uterus.
c. prevent more than one sperm from entering the egg.
d. attract additional sperm to the egg.
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Students have asked these similar questions
How can PID (pelvic inflammatory disease) lead to infertility in women?
Select one:
a. PID can lead to scar tissue developing on the Fallopian tube. This prevents the egg and the sperm from meeting, causing infertility.
b. PID prevents the endometrium from forming. There is not enough material for the fertilized egg to implant itself.
c. PID leads to scar tissue on the corpus luteum. This disrupts ovulation.
d. PID affects the cervix. This causes the cervix to swell, decreasing the chance a sperm could pass into the uterus.
Which of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veins
Identify a characteristic of a fetus in the sixth month of gestation.
a. It weighs between 5 and 7 pounds.
b. It can open and close its eyes and look in all directions.
c. It has fully developed reflex patterns.
d. It has a respiratory system that is adequate to survive outside the womb.
Chapter 27 Solutions
CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
Ch. 27 - This graph plots the rise and fall of pituitary...Ch. 27 - Turns into the corpus luteum a. vas deferens b....Ch. 27 - a. vas deferens b. prostate gland c. endometrium...Ch. 27 - Prob. 4TYKCh. 27 - Prob. 5TYKCh. 27 - Site of human gestation a. vas deferens b....Ch. 27 - Prob. 7TYKCh. 27 - Secretes seminal fluid a. vas deferens b. prostate...Ch. 27 - Prob. 9TYKCh. 27 - After a sperm penetrates an egg, it is important...
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- The cause of menses in the uterine cycle appears to bea. increased progesterone secretion from the ovary, which producesblood clotting.b. increased estrogen secretion from the ovary, which stimulates themuscles of the uterus to contract.c. decreased progesterone secretion by the ovary.d. decreased production of oxytocin, causing the muscles of the uterusto relaxarrow_forwardOnly one sperm enters an egg becausea. sperm have an acrosome.b. the corona radiata gets larger.c. changes occur in the zona pellucida.d. the cytoplasm hardens.e. All of these are correct.arrow_forwardA study of the early embryo indicates that the glans penis of the maledevelops from the same embryonic structure as which of these femalestructures?a. labia majora c. clitoris e. urinary bladderb. uterus d. vaginaarrow_forward
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- Which of the following statements about gastrulation is correct? A. During gastrulation, the contents of cell nuclei begin to vary so that they can start to perform different fucntions. B. During gastrulation, cells differentiate so that they can start to perform different functions. C. The formation of the endoderm, mesoderm, and ectoderm occurs after gastrulation. D. The formation of the endoderm, mesoderm, and ectoderm occurs before gastrulation.arrow_forwardOdontoblasts are derived from a. Ectoderm b. Endoderm c. Histiocytes d. Undifferentiated mesenchymal cellsarrow_forwardWhich of the following is not a mechanism on how contraceptive pills work to prevent pregnancy? A. thinning the endometrium to prevent implantation B. inhibition of follicular development and suppression of ovulation C. progesterone inhibits the sperm from penetrating through the cervix and female upper tract by making the cervical mucus unfriendly D. stimulates the production of high testosterone levelsarrow_forward
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