Human Anatomy & Physiology (2nd Edition)
2nd Edition
ISBN: 9780134553511
Author: Erin C. Amerman
Publisher: PEARSON
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Chapter 27, Problem 15CYR
Summary Introduction
To review:
Number the sequence of events that are responsible for initiating labor:
1. The hypothalamus of the mother and fetus stimulates the placenta to secrete prostaglandins.
2. Fetal cortisol levels increase andstimulate the placenta to release estrogen.
3. Prostaglandins and oxytocin stimulate the uterus to contract.
4. Estrogen stimulates the myometrium to form oxytocin receptors.
Introduction:
Parturition is the process where the fetus is expelled out of the mother’s body from the uterus through the vagina. It occurs in a sequential manner which is called labor. It usually occurs at the end of 39 weeks with a variation of 1-2 weeks. Premature births can cause the development of several complications in the child.
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Chapter 27 Solutions
Human Anatomy & Physiology (2nd Edition)
Ch. 27.1 - What are the three major periods of prenatal...Ch. 27.1 - 2. When does the postnatal period of life begin?
Ch. 27.2 - Prob. 1QCCh. 27.2 - What are the steps of fertilization?Ch. 27.2 - 3. What is the function of cleavage of the...Ch. 27.2 - How does a morula differ from a blastocyst?Ch. 27.2 - 5. What is the ultimate fate of the inner cell...Ch. 27.2 - 6. Which cell type secretes hCG?
Ch. 27.2 - 7. What are the functions of amniotic fluid?
Ch. 27.2 - 8. What are the main functions of each of the...
Ch. 27.3 - Prob. 1QCCh. 27.3 - 2. Which cells form the three germ layers?
Ch. 27.3 - 3. What are the two types of embryonic folding?...Ch. 27.3 - What is the first major event that occurs during...Ch. 27.3 - Prob. 5QCCh. 27.4 - Prob. 1QCCh. 27.4 - Prob. 2QCCh. 27.4 - What specific changes occur in each month of fetal...Ch. 27.4 - Prob. 4QCCh. 27.5 - Prob. 1QCCh. 27.5 - Prob. 2QCCh. 27.5 - Which hormone stimulates the beginning of...Ch. 27.5 - Prob. 4QCCh. 27.6 - What are the criteria used to determine a newborns...Ch. 27.6 - Prob. 2QCCh. 27.6 - 3. Explain what happens to each structure in the...Ch. 27.6 - Prob. 4QCCh. 27.6 - What role do hormones play in the let-down reflex...Ch. 27.7 - What is the genome? How many chromosomes are in...Ch. 27.7 - Prob. 2QCCh. 27.7 - 3. How does a genotype differ from a phenotype?
Ch. 27.7 - Prob. 4QCCh. 27.7 - Prob. 5QCCh. 27.7 - 6. What is an X-linked disorder? How can a female...Ch. 27 - Match the correct time period of gestation with...Ch. 27 - Prob. 2CYRCh. 27 - Mark the following statements about fertilization...Ch. 27 - Prob. 4CYRCh. 27 - Number the sequence of events in fertilization....Ch. 27 - Prob. 6CYRCh. 27 - Match the extraembryonic membrane with the correct...Ch. 27 - Prob. 8CYRCh. 27 - Match the structures of the embryo with the...Ch. 27 - What are the two types of embryonic folding?Ch. 27 - Prob. 11CYRCh. 27 - Prob. 12CYRCh. 27 - Prob. 13CYRCh. 27 - Prob. 14CYRCh. 27 - Prob. 15CYRCh. 27 - Prob. 16CYRCh. 27 - 17. Fill in the blanks: The first ____________...Ch. 27 - Prob. 18CYRCh. 27 - Prob. 19CYRCh. 27 - Which pattern of inheritance includes examples of...Ch. 27 - Prob. 1CYUCh. 27 - Why is the single-celled zygote approximately the...Ch. 27 - Prob. 3CYUCh. 27 - Prob. 4CYUCh. 27 - Prob. 1AYKACh. 27 - Prob. 2AYKACh. 27 - Prob. 3AYKACh. 27 - Prob. 4AYKACh. 27 - Prob. 5AYKB
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- Use the following list of reproductive hormones and structures to answer the next question. FSH LH Estrogen Progesterone GnRH Follicle Corpus luteum Hypothalamus Anterior pituitary Gonadotropic hormones are released by the anterior pituitary to regulate the functions of the gonads (testis in males and ovaries in females). Use the list to select a gonadotropic hormone, the structure it stimulates in the ovaries, and the main hormone that is released by that structure as a result. (There are two possible answers.) ____ Gonadotropic hormone ____ Structure it acts on ____ Main hormone releasedarrow_forward________________________is the period of development from fertilization to birth, whereas is the period of development from birth to death.arrow_forwardFill in the blank: The myometrium is largely composed of _______________________ tissue.arrow_forward
- For each hormone, select whether the hormone is increasing or decreasing at the beginning of parturition. In addition, select the correct effect that the change in hormone secretion causes. Hormone Levels Resulting Effect Increasing Decreasing Causes the endometrial layer to break away from the uterus Causes the endometrial layer to be maintained Increases uterine contractions Decreases uterine contractions Increases milk production in the mother's breasts Decrease milk production in the mother's breasts Hormone Hormone Levels Resulting Effect Estrogen Progesterone Oxytocin Prostaglandins Prolactinarrow_forwardFill in the blank: After the eighth week, a developing human is called a(an) ___________________ until the time of birth.arrow_forwardUse the following list of reproductive hormones and structures to answer the next two questions. FSH LH Estrogen Progesterone GnRH Follicle Corpus luteum Hypothalamus Anterior pituitary Gonadotropic hormones are released by the anterior pituitary to regulate the functions of the gonads (testis in males and ovaries in females).Use the list to select a gonadotropic hormone, the structure it stimulates in the ovaries, and the main hormone that is released by that structure as a result. (There are two possible answers.) Record your answer as a 3 digit number from left to right in the same order as your answers from top to bottom of the list. ____ Gonadotropic hormone ____ Structure it acts on ____ Main hormone releasedarrow_forward
- Milk production in the mammary glands is stimulated by a hormone from the pituitary gland called_______ .Another hormone,_______ , stimulates contraction of both the uterine muscles during childbirth and the muscles around the mammary glands that cause milk to be ejected from the glands.arrow_forwardImagine that your 9-year-old daughter has just told you that her best friend has started her period. She wants to know when she is going to start hers. She also is confused about what a period even is. Write out a potential script you could use to answer your daughter's questions. Explain when she can expect to begin her period and describe what occurs during the menstrual cycle.arrow_forwardSherrise is a sexually active college student. OnSaturday night, she has unprotected sex with her boyfriend.On Tuesday morning, she experiences the twinge of midcyclepain that she typically feels when she is ovulating.This makes Sherrise extremely anxious that she might soonlearn she is pregnant. Is Sherrise’s concern valid? Why orwhy not?arrow_forward
- The childbirth process is controlled by a positive feedback mechanism. Explain how the mechanism works.arrow_forwardUse the following information to answer the next two questions.Birth control pills are oral contraceptives taken by women to prevent pregnancies. The most effective forms of birth control pills contain estrogen and a small amount of progestin (a synthetic hormone that mimics the effects of progesterone). The role of estrogen in the birth control pill is to Select one: a. prevent a rise in the FSH and LH levels, thereby preventing follicle maturation b. reduce the progesterone levels in the blood to limit the endometrium buildup c. suppress the shedding of endometrium, thus preventing menstruation d. negatively feedback to the anterior pituitary to suppress the production of GnRHarrow_forwardHarsha Aggarwal please answer Name and describe the role of hormones secreted by ovaries, testes and placenta.arrow_forward
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