Chapter 27 HW
During the preschool examination of a 4-year-old boy, you are unable to palpate his testes within the scrotal sac. His parents state that previous exams have been normal, and that the testes are clearly visible during baths. What is the most likely explanation?
A chilly examination room or your cold hands have activated the cremasteric reflex.
What hormone, produced in the anterior pituitary gland, works in conjunction with gonadal steroids to promote bone development in males?
Luteinizing hormone
What event coincides with the transition from the proliferative phase to the secretory phase?
Ovulation occurs
Why are the male testes located in the scrotum, outside the abdominopelvic cavity?
Spermatogenesis is temperature sensitive.
A couple is undergoing evaluation for difficulty conceiving a child. The female is able to ovulate, and the male produces adequate normal sperm. The woman reports 20 days between menses. What problem does this suggest?
The corpus luteum may cease production of progesterone too soon.
Why does only one egg, rather than four eggs, develop during oogenesis, given that spermatogenesis results in four sperm formed from one stem cell?
Unequal cytoplasmic division ensures that a fertilized egg has ample nutrients for its journey to the uterus.
The ___________ is the structure at the tip of a sperm that contains enzymes to gain access to an egg during fertilization.
acrosome
vagina
birth canal
ductus deferen
carry sperm toward ejaculation
What ovarian structure forms at the beginning of the secretory phase, encouraging its progress, and then degenerates just before menses?
corpus luteum
The ____________ is the nutritive layer of the uterus prepared for the possibility of a fertilized egg.
endometrium
The cells that produce testosterone in the testis are called ________.
interstitial endocrine cells
Which of the following female structures is homologous to the male scrotum?
labia majora
The _______________ are the lips that enclose the vestibule of the female external genitalia.
labia minora
Which of these structures directly encloses the vestibule?
labia minora
A surge in __________ directly triggers ovulation.
luteinizing hormone (LH)
During what phase of the female's uterine cycle is the uterine lining shed?
menstrual phase
The middle embryonic germ layer that forms everything except the epidermis of the skin, nervous system, and epithelial linings and glands is the ___________.
mesoderm
prostate gland
milky, acidic semen
Which layer of the uterus is made of smooth muscle?
myometrium
bulbourethral gland
neutralize urethra before ejaculation, lubricating secretion
ovarian follicle
ovum (egg) production
If a male undergoes a vasectomy, which of the following can no longer take place?
passage of sperm cells from the epididymis to the urethra
seminal vesicles
produce semen, 70% of seminal volume
Which of the following is considered a role of primary sex organs?
production of sex hormones
Which of the following cells is released during ovulation?
secondary oocyte
Which of the following shows the correct pathway for sperm cells as they leave the testes?
seminiferous tubule, rete testis, epididymis, ductus deferens
Sperm is produced in the __________.
seminiferous tubules
Stem cells that give rise to sperm are ___________.
spermatogonia
The __________ is shed during each menstruation and is then regenerated by the __________.
stratum functionalis; stratum basalis
Which of the following is/are contained within the spermatic cord?
testicular arteries and veins
During the secretory phase of the uterine cycle, __________.
the endometrium prepares for implantation
Formation of a secondary oocyte occurs during __________.
the follicular phase
uterine tube
transport ovum to uterus
Which of the following cells remains at the basal lamina to continue the pool of dividing germ cells?
type A daughter cells
