Week 9 Flashcards
(20 cards)
what does the urinary system compromise of
- 2 kidneys
- 2 ureters
- Urinary bladder
- Urethra
what do pct secrete and reabsorb
secrete:
H+. NH4+, organic ions and cations
reabsorb:
glucose, proteins, vitamins,, 60-85% of water reabsorbed
function of Intercalated cells and where they are found
found in DCT. function is to regulate pH
structure of thick limbs in nephron
Simple cuboidal epithelium with no microvilli, but many mitochondria
structure of thin limbs in nephron
Simple squamous epithelium with few
mitochondria
special feature of DCT
contains macula densa (a chemoreceptor)
function of macula densa
Regulation of the rate of
Na+ absorption in DCT: by
aldosterone (adrenal glands)
where are umbrella cells found
ureters
what is the muscularis arrangement of the urinary bladder
inner longitudinal, middle circular, and
outer longitudinal
what CT surrounds the testes
tunica albuginea
what 2 cells are found in the Seminiferous Tubules
- Spermatogenic cells (germ cells)
- Sertoli cells
spermatogenic cells
spermatogonia»primary and secondary spermatocytes
spermatocytes produce spermatids
spermatids mature into spermatoza
how long does spermatogenesis take to occur
64-74 days
characteristics of sertoli cells
secrete fluid and many substances, including androgen- binding protein (ABP). This protein binds testosterone.
what does the Intratubular space contain and what are their characteristics
CT and Leydig (interstitial) cells
they are large polyhedral cells have an
eccentric spherical nucleus with one or
two prominent nucleoli, and cell
surfaces have numerous small
microvilli.
why do the Leydig cells have a foamy, washed out cytoplasm
due to high lipid content, as they store cholesterol for synthesis of testosterone.
EPIDIDYMIS function
- Responsible for transmitting spermatozoa
from the rete testes to the vas deferens
characteristics of prostate
Production of prostatic fluid
that contains prostaglandins
and prostate-specific
antigen (PSA).
characteristic of penis
Two dorsal corpora cavernosa
* Each of them surrounded by tunica albuginea
A ventral corpus spongiosum
* Surrounds the penile urethra
characteristics of erectile penis
Erectile tissues; consist of:
* Venous cavernous spaces
§ Lined with endothelium
§ Separated by trabeculae with smooth
muscle and connective tissue
continuous with the surrounding tunic
