What increases blood volume and pressure in corpora cavernosa during erection is:
increase in sympathetic discharge
contraction of ischiocavernosa and bulbocavernosa muscles
increase arterial flow and closure of emissary veins
shunting of blood from the dorsal to the central cavernosal artery
Correct Answer :
C. increase arterial flow and closure of emissary veins
penile erection occurs due to parasympathetic outflow that leads to dilation of cavernosal smooth muscles and trapping of blood in the corpora as a result of the closure of emissary veins.
Related Questions
What is false about purple urine bag syndrome?
occurs due to the interaction between the chemical components of the urine and polyvinyl chloride material in the urine bag
it is commonly symptomless
more common in female nursing home residents
commonly implicated bacteria are K. pneumoniae, P. mirabilis, E. coli
How many days does spermatogenesis take in the man?
16
32
64
90
Which class of the following diuretics could cause erectile dysfunction?
loop diuretics
thiazide diuretics
potassium sparing diuretics
osmotic diuretics
Which of the prostate medications could result in significant hypotension?
finasteride
prazosin
silodosin
vardenafil
Which of the following is false regarding zona glomeruloza?
the most superficial layer of the adrenal cortex
responses to increased potassium levels, renin or decreased renal blood flow
it causes pheochromocytoma
secretes aldosterone
Which class of the following agents does NOT impair spermatogenesis?
alkylating agents
phenothiazines
antiandrogens
prostaglandins
Which part of the prostate is traversed by the ejaculatory duct:
central zone
peripheral zone
transitional zone
fibromuscular stroma
Which area in the nervous system is tested by bulbocavernosus reflex?
brain stem
C2 C4
S2 - S4
L2 - L4
What are the first and second most common zones from where prostate cancers arise?
central then transitional
peripheral then transitional
peripheral then central
transitional then central
The majority of circulating testosterone is:
bound to sex hormone-binding globulin
free
bound to α1-antichymotrypsin
bound to albumin
By which of the following structures, do the fused lower poles of hoarseshoe kidneys get trapped during embryologic ascent?
inferior mesenteric artery
superior mesenteric artery
celiac artery
common iliac artery
The commonest neoplasms that metastasize to kidneys come from:
breasts
thyroids
lungs
liver
Which of the renal artery occlusive conditions, commonly, do NOT affect renal function?
intimal fibroplasia
medial fibroplasia
medial hyperplasia
serosal hyperplasia
Which of the following is NOT a component of the normal semen?
zinc
fructose
prostate-specific antigen
alkaline phosphatase
Which innervations mediate detumescence?
cavernous nerves
dorsal nerves of the penis
sympathetic nervous system
parasympathetic nervous system
Which statement is false concerning capacitation of spermatozoa?
occurs after acrosome reaction
entails removal of a glycoprotein layer
it is a biochemical event of sperm maturation
changes occur in the female genital tract
The mature genitourinary system develops from all of the following embryonic sources, EXCEPT:
intermediate mesoderm
mesothelium of celomic cavity
endoderm of the urogenital sinus
somatic ectoderm
What is false concerning renal vasculature?
there are 4 surgical segments of the kidney, based on the segmental artery distribution
along the kidney convexity, there is an avascular plane
there are no collaterals between segmental arteries
in < 10%, the posterior branch is the first to branch off the renal artery
Which statement is NOT related to Klinefelter syndrome?
sterility is the rule
has a considerable short life span
treatment requires testicular microdissection and sperm extraction
47 XXY karyotype
Which agent is safe to kidneys?
amoxicillin
gentamycin
diclofenac
herb extract
What is the half-life of β-HCG?
5 7 days
24 36 hours
2 3 days
12 24 hours
Which of the following does asymptomatic hematuria workup include?
cystoscopy
CT urography
urine cytology
all of the above
Which statement explains the first event in the micturition reflex?
opening of internal bladder sphincter
fall in urethral pressure
rise in intravesical pressure
cessation of sphincter EMG activity
What is the number of bacteria per high-power field microscopy that matches colony counts of 100,000/mL?
100
50
10
5
What do the specialized cells, at the juxtaglomerular apparatus, produce?
erythropoietin
renin
angiotensin I
angiotensinogen
At which condition is alpha-fetoprotein most frequently elevated?
infiltrating ductal carcinoma of the breast
seminoma
hepatocellular carcinoma
malignant melanoma
What causes pure testicular feminization is:
over estrogen synthesis
defective end-organ androgen response
extra X chromosome (XXY)
failure of genital ridge regression
What are the abnormalities that might accompany complete ureteral duplications?
reflux to the upper pole ureter, obstruction to the lower pole ureter
reflux to the lower pole ureter, obstruction to the upper pole ureter
left ureteropelvic junction obstruction, right ureterocele
right ureteropelvic junction obstruction, left ureterocele
When should a 70 yrs. man with 40 ml prostate volume, and total PSA of 2.0 ng/ml, go for a prostate biopsy?
if PSA reading had exceeded 2.7 ng/ml over 12 months
if free PSA reading was less than 0.4 ng/ml
if total PSA reading was greater than 8 ng/ml
any of the above
Which of the following conditions could happen in chronic pancreatitis and malabsorption syndrome with steatorrhea?
hyperoxaluria
hypercalciuria
hyperuricosuria
hyperphosphateuria