BIO 163: CH 27 + 28

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The normal diploid number of human chromosomes found in normal cells is _______. A) 50 B) 23 C) 12 D) 46

46

What percentage of sperm carry the Y chromosome? A) 10% B) 25% C) 50% D) 75%

50%

True or False? A pregnancy test involves antibodies that detect estrogen levels in a woman's blood or urine.

FALSE

True or False? Estrogen and Progesterone levels are lower in pregnant than non-pregnant women.

FALSE

True or False? Fetal and maternal blood regularly mix during pregnancy.

FALSE

True or False? Menstruation begins as the corpus increases production of estrogen and progesterone.

FALSE

A spike in what hormone directly stimulates ovulation? A) progesterone B) FSH C) estrogen D) LH

LH

Erection of the penis results from ________. A) a sympathetic reflex B) sympathetic activation of the bulbourethral glands C) a parasympathetic reflex producing nitric oxide D) none of these

a parasympathetic reflex producing nitric oxide

Which of the following cannot pass through the placental barrier? A) blood cells B) glucose C) gases D) antibodies

blood cells

Normally menstruation occurs when ________. A) blood levels of FSH fall off B) blood levels of estrogen and progesterone decrease C) blood levels of estrogen and progesterone increase D) the corpus luteum secretes estrogen

blood levels of estrogen and progesterone decrease

The type of cell division that takes place in gamete formation is ______________ A) mitosis B) meiosis C) symbiosis

meiosis

Muscle tissue is formed by the ________. A) mesoderm B) ectoderm C) endoderm D) epiderm

mesoderm

The germ layer from which the skeletal muscles, heart, and skeleton come is the __________ . A) endoderm B) ectoderm C) mesoderm D) epiderm

mesoderm

The muscle layer of the uterus is the _______ A) perimetrium B) endometrium C) myometrium D) epimetrium

myometrium

The corpus luteum is formed at the site of __________ . A) fertilization B) urination C) ovulation

ovulation

Erection of the penis and clitoris is a result of the _________ A) somatic nervous system B) sympathetic nervous system C) parasympathetic nervous system D) none of these

parasympathetic nervous system

The male copulatory organ is the _________ A) Penis B) Vagina

penis

The male homologue of the clitoris is the __________ . A) penis B) scrotum C) testes D) urethra

penis

Sperm is produced in the ___________ A) epididymis B) seminal vesicle C) urethra D) seminiferous tubules

seminiferous tubules

Ejaculation is a result of ____________ A) sympathetic nervous system B) parasympathetic nervous system C) somatic nervous system

sympathetic nervous system

Human egg and sperm are similar in that ________. A) about the same number of each is produced per month B) they have the same degree of motility C) they have the same number of chromosomes D) they are about the same size

they have the same number of chromosomes

The usual site of embryo implantation is the A) fallopian tube B) ovary C) bladder D) uterus

uterus

The female copulatory organ is the _________ A) Penis B) Vagina

vagina

The layer of the myometrium that is shed during menstruation is the ______________ A) perimetrium B) endometrium C) myometrium D) epimetrium

endometrium

Which of the following is not a germ layer? A) ectoderm B) mesoderm C) epiderm D) endoderm

epiderm

Sperm is matured in the ___________ A) epididymis B) seminal vesicle C) urethra D) seminiferous tubules

epididymis

During which stage of labor is the fetus delivered? A) dilation stage B) expulsion stage C) placental stage D) gastrula stage

expulsion stage

Fertilization generally occurs in the ________. A) ovary B) uterus C) vagina D) fallopian tubes

fallopian tubes

The haploid numberof chromosomes found in gametes is __________ A) 50 B) 23 C) 12 D) 46

23

Which hormone maintains the viability of the corpus luteum? A) estrogen B) progesterone C) human chorionic gonadotropin (HCG)

HCG

True or False? A pregnant woman urinates more often than usual because the uterus compresses the bladder, and she must also dispose of fetal metabolic wastes.

TRUE

True or False? Fertilization occurs while the egg is still in the ovarian follicle.

TRUE

True or False? It is necessary for the testes to be kept below body temperature for abundant, viable sperm formation.

TRUE

True or False? Of the three germ layers, the mesoderm forms the most body parts.

TRUE

True or False? The Pap smear is a test to detect cancerous changes in cells of the cervix.

TRUE

True or False? The chorion helps form the placenta.

TRUE

The sex of a child is determined by _____________. A) The sex chromosome contained in the sperm B) The sex chromosome contained in the oocyte C) The position of the fetus in the uterus

The sex chromosome contained in the sperm

A ruptured follicle is transformed into the ________. A) antrum B) ovarian follicle C) corpus luteum D) germinal epithelium

corpus luteum


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