spermatogenesis Flashcards
process BEGINS AT PUBERTY and constantly throughout a man’s life
Spermatogenesis
Spermatogenesis occurs in the ________ that form the bulk of each testis
seminiferous tubules
process of spermatogenesis begins with _______ of the _______.
mitosis, diploid spermatogonia
How long does it take for one production
cycle, from spermatogonia to sperm, to take
place?
64 days
Three phases of spermatogenesis
Spermatocytogenesis
Meiosis
Spermiogenesis
phase where germ cells (spermatogonium) DIVIDE MITOTICALLY to REPLACE THEMSELVES and to
PRODUCE CELLS that begin differentiation
Spermatocytogenesis (Mitosis)
FIRST MEIOTIC DIVISION of cells are in
prophase
Cells in prophase of the FIRST MEIOTIC DIVISION are ______
primary spermatocytes
what go through the first meiotic division and BECOME SECONDARY SPERMATOCYES
Spermatocytes
process by which the diploid number of chromosomes present in spermatogonia (the germ cells) is REDUCED TO THE HAPLOID NUMBER present in mature spermatozoa
Meiosis
products of the second meiotic division are called
spermatids
METAMORPHOSIS of spherical spermatids
into elongated spermatozoa.
Spermiogenesis
t/f
in Spermiogenesis, no further mitosis or meiosis occurs
t
During spermiogenesis, the _______ forms,
the ________ forms, and most
________ (the residual body) is
separated and left in the ______
acrosome, flagellar apparatus, excess cytoplasm, Sertoli cell
Spermatozoa are released into the ______ of
the seminiferous tubule
lumen
Sertoli Cell in Spermatogenesis SECRETE ______ that promote sperm production
SIGNALING MOLECULES
Sertoli Cell has also been called the _____ or
______ cell
“mother” or “nurse”
Sertoli Cell form what barrier
BLOOD-TESTIS BARRIER
Provide factors necessary for the successful progression of spermatogonia (germ cells) into spermatozoa (sperm).
Sertoli Cell
Helps in development and maturation of
sperm cells
Sertoli Cell
Sertoli Cell provide protection to ____
germ cells
Sertoli Cell have receptors for _____ and _____
follicle stimulating hormone, testosterone
t/f
follicle stimulating hormone (FSH) and testosterone are the main hormonal regulators of spermatogenesis.
t
Hormones involved in Spermatogenesis
Testosterone
Follicle Stimulating Hormone (FSH)
Luteinizing hormone (LH)
hormone that has the ability to STIMULATE SERTOLI CELL mitosis during testicular development
FSH
t/f
Both FSH and LH exert synergistic actions on germ cells,
f
Both FSH and TESTOSTERONE
hormone that has a SPECIFIC ACTION on the later stages of spermatid maturation.
testosterone
