Daniel D. Chiras: Human Biology, Fifth Edition: Practice Quizzes

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Title Text: Daniel D. Chiras: Human Biology, Fifth Edition

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Tools For Learning: Practice Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: During embryonic development, the sperm and ovum combine to form
	A: a morula
	B: a zygote
	C: endoderm
	D: ectoderm

2: Which of the following is true?
	A: In humans, sperm are deposited in the vagina
	B: Sperm move through the reproductive tract primarily as a result of the beating of their tails
	C: Digestive enzymes in the acrosome help the sperm penetrate the fluids in the cervix
	D: a and d
	E: b and c

3: Which of the following best describes the proper sequence of development?
	A: Zygote, blastocyst, morula
	B: Morula, zygote, blastocyst
	C: Zygote, morula, blastocyst
	D: None of the above

4: Which of the following is true?
	A: Implantation occurs about two weeks after fertilization
	B: The inner cell mass of the blastocyst will become the embryo
	C: The trophoblast releases enzymes that digest a hole in the endometrium, permitting the blastocyst to bore its way into the uterine lining
	D: a and d
	E: b and c

5: Which of the following is not a function of the placenta
	A: Hormone production
	B: Ridding wastes from the fetus
	C: Nutrition
	D: Respiration
	E: None of the above

6: HCG
	A: is an LH-like hormone produced by the placenta
	B: is secreted by the placenta throughout pregnancy
	C: stimulates estrogen and progesterone production by the corpus luteum
	D: a and b
	E: a and c

7: Which hormone is thought to be responsible for morning sickness?
	A: Estrogen
	B: Progesterone
	C: PMS
	D: HCG

8: The amnion
	A: forms from the trophoblast
	B: is filled with a watery fluid that protects the baby during development
	C: gives rise to the nervous system of the embryo
	D: None of the above

9: Which of the following is not true
	A: The inner cell mass gives rise to three germ cell layers: the ectoderm, mesoderm, and endoderm
	B: The central nervous system arises from ectoderm, which forms the neural groove
	C: Nerve cells that attach to the spinal cord and brain develop from small groups of ectodermal cells that lie on either side of the neural tube
	D: Muscle, cartilage, and bone are derived from endoderm

10: The yolk sac
	A: is derived from mesoderm
	B: provides nourishment to growing human embryos
	C: gives rise to primitive germ cells that migrate into the developing testes and ovaries
	D: None of the above

11: Ectopic pregnancies
	A: usually occur in the uterine tubes
	B: are very rare in humans
	C: generally proceed to term
	D: None of the above

12: Approximately ____ of all conceptions end in miscarriage.
	A: 10%
	B: 20%
	C: 30%
	D: 40%

13: Approximately____% of all newborns has some kind of birth defect.
	A: 2 to 5
	B: 10 to 12
	C: 15 to 18
	D: 20 to 23

14: A substance that causes a birth defect is known as a
	A: teratogen
	B: mutagen
	C: carcinogen
	D: toxicant

15: Which of the following does not influence the effect of a chemical agent on the developing embryo?
	A: The time of exposure
	B: The chemical nature of the substance
	C: The dose
	D: None of the above

16: Several factors stimulate uterine contractions during childbirth; they are
	A: rising estrogen levels
	B: an increase in the number of oxytocin receptors in the smooth muscle cells
	C: maternal oxytocin secretion
	D: a and c
	E: a, b, and c

17: Which of the following hormones causes the cervix to relax prior to childbirth?
	A: Estrogen
	B: HCG
	C: Progesterone
	D: Relaxin

18: Which of the following is true?
	A: The first stage of childbirth is called the expulsion stage
	B: Surgical incisions called episiotomies are used to open the vaginal opening during birth
	C: The placenta continues to pump blood into the newborn for 5-10 minutes after the baby is born
	D: Most breech births babies are delivered feet first

19: Milk production
	A: is stimulated by the hormone oxytocin
	B: is stimulated in part by a placental hormone known as human chorionic somatomammotropin
	C: is stimulated by high levels of estrogen and progesterone
	D: None of the above

20: Which of the following is true regarding aging?
	A: A healthy lifestyle can help eliminate many diseases that occur in older people
	B: Diseases such as osteoporosis and arthritis are the inevitable consequence of aging
	C: The immune system continues to function at a high level, even as we age
	D: Oxygen-free radicals tend to decrease as one ages

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