Card Set Information
SLCC Anatomy Melanie Birdsong Farr 2320
Information about the Urinary system
What are the 3 functions of the urinary system?
Production and storage of urine – the means by which nitrogenous and other wastes are rid from the body
Regulation of blood volume and blood pressure
Regulation of RBC production – by means of hormones released from the kidneys
What makes up the urinary system?
What are the tissue layers of the kidney (in order from deep to superficial)
(1) the kidneys are
(2) surrounded by fibrous or renal capsule on the surface =
dense irregular connective tissue
perinephric (or perirenal) fat
renal fascia – dense irregular connective tissue
paranephric (or pararenal) fat
between the renal
fascia and the peritoneum
(6) on the anterior surface, the
paranephric fat contacts
the parietal peritoneum
What is the path that urine follows to leave the body?
1.Urine travels from renal pyramid
2. Renal papilla
3. Minor calyx
4. Major calyx
5. Renal pelvis
7. Urinary bladder
9. Outside of the body
Blood flow through the kidneys
1. Abdominal Aorta
starting at renal sinus
d. Peritubular capillaries or Vasa Recta
What are the functions of the motor and sensory neurons at the renal plexes?
: Vagus nerve: no known function
Controls diameter of kidney arterioles
May stimulate hormone release
Basic urinary formation:
Explain what filtration means in the kidneys:
Process by which water, solutes, wastes, ions, and nutrients
pass from the blood plasma to the capsular space of the renal corpuscle; because of pressure differneces across the filtration membrane
Explain Reabsorption in the kidneys:
Reabsorption in the kidneys is the movement of water, nutrients, and ions (as needed) back into the renul tubules
What is Secretion in the kidneys:
Secretion is the selective on last look at blood, excesses, waste, and (mictorion) (what goes in the toilet basically)
The nephron has 2 major parts:
What are they?
What are the tubular components?
proximal convoluted tubules
distal convoluted tubules
What are the Vascular components?
(also known as the microcirculation)
1. Interlobular artery
2. Afferent arterioles
4. Efferent arterioles
5. Peritubular capillaries or Vasa Recta
What is the difference in Peritubular capillaries and Vasa Recta?
Peritubular capillaries are associated with convoluted tubules
Vasa recta are associated with the nephron loop
What are the two structures that make up the renal corpuscle?
Glomerular capsule (Bowman capsule) which has 2 layers
and a space
1. visceral layer (inner) that surrounds the glomerulus
2. parietal layer (outer) formed from a simple squamous
3. capsular space that is between the inner and outer layer
What is the primary site of filtration in the kidney?
(where blood tube and pee tubes come together)
Why is there so much pressure in the Renal corpuscle?
the afferent arteriole is much larger than the efferent arteriole
Why is the renal corpuscle the site of filtration in the kidneys?
-capillaries are fenestrated in the glomerulus
-and the spaces between the inner layer and cells of the Bowman's capsule to allow for filtration
-lot of surface area
Filtrate starts and ends where?
Starts as it is coming out of the glomerulus
Ends at the beginning of the collecting ducts
After that it is called urine
What is the Filtrate flow?
1. Proximal convoluted tubule (PCT)
2. Nephron Loop or Loop of Henley made up of first the
descending limb and then the ascending limb
3. Distal convoluted tubule (DCT)
4. Collecting Duct
(done with everything except water which can be pulled back in by osmosis)
What is the Filtrate flow after the collecting duct?
1. Renal papilla
2. Minor calyx
3. Major calyx
4. Renal pelvis
6. Urinary bladder
The efferent arteriole branches to form 2 different capillary beds, what are they?
1. Peritubular capillaries
2. Vasa Recta
both are low pressure and porous
Are responsible the exchange of gases, nutrients, and waste materials within the kidney
Where do the peritubular capillaries reside?
Cortex of the kidney
Where do the vasa recta reside?
Medulla of the kidney
What is the blood flow from the the entering of the kidney to the efferent arterioles?
Up to 5 segmental arteries
Renal corpuscle & forms a capillary network called Glomerulus
(branches into capillary networks)
What is the blood flow from the Efferent arterioles to the inferior vena cava?
2. Capillary beds (Peritubular capillaries & Vasa recta)
Network of Veins
Interlobular Veins-travel beside
Interlobular veins-through renal columns to renal sinus
Renal Vein- formed by interlobular veins merging in renal sinus
Inferior Vena Cava