BIO 163: CH 27 + 28
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
