Animal Reproduction Continued
Card Set Information
Animal Reproduction Continued
Ovulation expels an egg cell from the
The remaining follicular tissue grows within the ovary, forming a mass called the
The corpus luteum secretes hormones that help to maintain what?
If the egg is not fertilized, the corpus luteum what?
The egg cell travels from the ovary to the uterus via an?
oviduct or fallopian tube
what in the oviduct convey the egg to the uterus, also called the womb?
the endometrium is what?
the uterus lining
has many blood vessels
what happens to the uterus at the cervix?
uterus narrows, then opens into the vagina
Internal organs are the what, which produce sperm and hormones, and accessory glands
testes consist of?
of highly coiled tubes surrounded by connective tissue
where sperm form
Leydig cells produce?
hormones and are scattered between the seminiferous tubules
Production of normal sperm cannot occur at the body temperatures of most mammals
the production of gametes by meiosis, differs in females and males
is production of mature sperm
Sperm are small and motile and are produced throughout the life of a sexually mature male
development of mature oocytes (eggs) and can take many years
Eggs contain stored nutrients and are much larger
what are the three differences between spermatogenesis and oogenesis?
–In oogenesis, one egg forms from each cycle of meiosis; in spermatogenesis four sperm form from each cycle of meiosis
–Oogenesis ceases later in life in females; spermatogenesis continues throughout the adult life of males
–Oogenesis has long interruptions; spermatogenesis produces sperm from precursor cells in a continuous sequence
Human reproduction is coordinated by hormones from what 3 things?
hypothalamus, anterior pituitary, and gonads
Gonadotropin-releasing hormone (GnRH) is secreted by the hypothalamus and directs the release of what and what from the anterior pituitary
FSH and LH
what do FSH and LH regulate?
processes in the gonads and the production of sex hormones
promotes the activity of Sertoli cells, which nourish developing sperm and are located within the seminiferous tubules
regulates Leydig cells, which secrete testosterone and other androgen hormones, which in turn promote spermatogenesis
regulates the production of GnRH, FSH, and LH through negative feedback mechanisms
Sertoli cells secrete what hormone, which reduces what?
inhibin which reduces FSH secretion from the anterior pituitary
Prior to ovulation what happens to the endometrium?
endometrium thickens with blood vessels in preparation for embryo implantation
In females, the secretion of hormones and the reproductive events they regulate are cyclic
If an embryo does not implant in the endometrium, the endometrium is shed in a process called what?
changes in the uterus define the what?
menstrual cycle (also called the uterine cycle)
changes in the ovaries define what?
the ovarian cycle
The sequential release of GnRH then FSH and LH stimulates what?