production of semen Flashcards
what are the 3 stages of sperm
spermatocyte
spermatid
spermatozoon
what are the parts of the sperm
end piece principle piece middle piece head nucleus acrosome
where does the sperm go after being made
travels from the seminiferous tubules to the rete testis, then efferent ductules and epididymis
what is the function of the epididymis
concentrates the semen sperm modelling metabolism motility of sperm changes the membrane components storage for several months
where is the bulbourethral gland
just below the prostate
what type of seminal fluid is produced in the seminal vesicle
alkaline, gelatinous
what type of seminal fluid is produced in the prostate
acidic and watery
what type of seminal fluid is produced in the bulbourethral glands
viscous and clear
what are the 3 accessory glands
prostate
seminal vesicle
bulbourethral gland
what are the major constituents of ejaculate
spermatozoa fructose inositol citric acid glycerylphosphorylcholine acid phosphatase
what is the function of fructose
anaerobic energy
what is the function of inositol
osmotic ballast
what is the function of citric acid
depresses semen coagulation
what is the function of glycerylphosphoryl choline
source of choline in phospholipid metabolism
what is the function of acid phosphatase
cleaves choline from gylcerophosphoryl choline
what artery runs through the corpus cavernosum
profunda artery
what part of the penis creates erection
corpus cavernosum
what part of the penis does the urethra travel through
corpus spongiosum
what produces arousal
psychological stimuli tactile stimuli (brain and local spinal reflexes)
what part of the nervous system maintains flaccidity
lower thoracic and lumbar spinal segments of the sympathetic nervous system
what part of the nervous system creates errection
erection centre in the sacro spinal segments of PSNS
how does the penis become erect
dilation of arterioles
closing of arteriovenous shunts that normally bypass the cavernosa
occlusion of veins that drain the penis
how does the parasympathetic NS create relaxation of vascular smooth muscle
ACh acts on vascular endothelial cells
this triggers NO release
this relaxes smooth muscle
what might failure to obtain an erection be caused by
damage to the cavernosa obstruction of arteries drugs that block the PSNS psychological factors stress with high SNS activity
