Lecture 15 - Micturition Flashcards
Filling of the bladder produces a signal via the pudendal nerve, resulting in ______
inhibition of the external urinary sphincter (pudendal n. is somatic and therefore voluntary)
Cortex of the brain will stimulate the micturition reflex, and inhibit the ______
external urinary sphincter
How do nephrons regulate acid-base balance?
A. Secretion of hormones that change afferent arteriole size, leading to increased acid/base excretion
B. Excrete acids (specificially sulfuric and phosphoric acids)
C. Secrete vasoactive factors to regulate blood flow, thereby changing excretion rates
B. Excrete acids
Kidneys produce what two major hormones?
Erythropoietic, and 1,25-dihydroxycalciferol (Vit D3)
What is the formula for the urinary excretion rate?
Filtration-reabsorption+secretion
Movement of solutes from the Glomerulus to the Bowman's capsule A. Filtration B. Reabsorption C. Secretion D. Excretion
A. Filtration
Solutes not initially filtered, but are placed into the filtrate from the blood. A. Filtration B. Reabsorption C. Secretion D. Excretion
C. Secretion
Removal of filtrate from the nephron A. Filtration B. Reabsorption C. Secretion D. Excretion
D. Excretion
Movement of filtered solutes back into blood. A. Filtration B. Reabsorption C. Secretion D. Excretion
B. Reabsorption
Glomerular hydrostatic and Glomerular osmotic pressure determines GFR. What else is a determinant of GFR?
Kf
The three components of the glomerular capillaries contain (positive/negative) charges.
negative
This is a change of nephron function before histological changes. It is due to loss of basement membrane (-) charges, resulting in proteinuria.
Minimal change nephrophathy
Four factors affecting GFR.
Glomerular hydrostatic P
Bowman’s hydrostatic P
Glomerular oncotic P
Bowman’s oncotic P
GFR of a normal, adult male
180 L/day
Dilation of the renal pelvis and calyces
Hydronephrosis
