Phys Final Exam: Urinary System

Urinary system

48 cards   |   Total Attempts: 182
  

Cards In This Set

Front Back
The kidneys receive blood supply via the _____ receiving approximately ___ of the heart's output of blood
Renal / 1/4
The basic unit of the kidney, that is composed of a vascular and tubular component
Nephron
Extend from the renal artery an enter the kidneys, carrying blood flow to the glomerulus of the nephron
Afferent arterioles
A tuft of filtering capable capillaries that represents the first step, filtration, in urinary production
Glomerulus `
Filtration involves a protein-free plasma that's filtered across glomerular membranes into ________
Bowman's capsule
The _________ surround the tubular parts of the nephron, which must eliminate the glucose, salt, and water from the kidneys and return them into the general circulation
Peritubular capillaries
______ is the collecting point for the glomerular filtrate. this represents the first portion of the tubular component
Bowman's capsule
Lies next to the glomerulus and bowman's capsule and represents the region where reabsorption occurs of the glomerular and bowman's capsule filtrate
Proximal convoluted tubule
Composed of two limbs, a descending limb that lead to the adrenal medulla, and an ascending limb that feeds upwards from the renal medulla and is a major component in developing water-retention mechanism
Loop of henle
The three steps involved in urine production
1. glomerular filtration
2. tubular reabsorption
3. tubular secretion
In glomerular filtration, protein free plasma indicates what?
Blood cells and proteins are excluded from the filtering process because pores in the capillaries are too small to admit by diffusion
3 pressures that must be accounted for in filtrartion1
1. blood hydrostatic pressure that drives the filtration system
2. plasma colloid(oncotic) pressure that opposes filtration
3. capsular hydrostatic pressure that also opposes filtration
________ pushes filtrarte through the glomerulus and into bowman's capsule
Blood hydrostatic pressure
Equation for calculating net pressure
Filtration pressure= blood hydrostatic presssure-( plasma oncotic pressure + bowmans capsular pressure)
What are the normal values for pressures?
1. blood hydrostatic pressure 70 mm Hg
2. plasma oncotic pressure 25 mm Hg
3. bowman's capsular hydrostatic pressure is 15 mm Hg
4. net (filtration) pressure 30 mm Hg