Lecture 15 - Micturition Flashcards Preview

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Flashcards in Lecture 15 - Micturition Deck (28):
1

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)

2

Cortex of the brain will stimulate the micturition reflex, and inhibit the ______

external urinary sphincter

3

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

4

Kidneys produce what two major hormones?

Erythropoietic, and 1,25-dihydroxycalciferol (Vit D3)

5

What is the formula for the urinary excretion rate?

Filtration-reabsorption+secretion

6

Movement of solutes from the Glomerulus to the Bowman's capsule
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion

A. Filtration

7

Solutes not initially filtered, but are placed into the filtrate from the blood.
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion

C. Secretion

8

Removal of filtrate from the nephron
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion

D. Excretion

9

Movement of filtered solutes back into blood.
A. Filtration
B. Reabsorption
C. Secretion
D. Excretion

B. Reabsorption

10

Glomerular hydrostatic and Glomerular osmotic pressure determines GFR. What else is a determinant of GFR?

Kf

11

The three components of the glomerular capillaries contain (positive/negative) charges.

negative

12

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

13

Four factors affecting GFR.

Glomerular hydrostatic P
Bowman's hydrostatic P
Glomerular oncotic P
Bowman's oncotic P

14

GFR of a normal, adult male

180 L/day

15

Dilation of the renal pelvis and calyces

Hydronephrosis

16

Filtration fraction is defined as _______.

GFR/renal plasma flow

17

Increasing the filtration fraction also increases the _____ oncotic pressure.

glomerular

18

Increased arterial pressure will (increase/decrease) GFR

increase

19

Increased afferent arteriolar resistance will (increase/decrease) GFR

decrease

20

Increased efferent arteriolar resistance will (increase/decrease) GFR

increase

21

Formula for renal blood flow

(Renal arterial P-Renal vein P)/TVR

22

Sympathetic activation will (increase/decrease) GFR.

decrease; the SNS will constrict the arterioles, and decrease blood flow to kidneys

23

Angiotensin preferentially constricts ____ arterioles.

efferent

24

Autoregulation acts to prevent (small/large) changes to GFR that would normally occur even with small blood pressure changes.

large

25

The juxtaglomerular complex acts to control ______.

the dilation of afferent and efferent arterioles

26

Reabsoprtion of NaCl in the _____ stimulates the juxtaglomerular complex

ascending limb of loop of Henle

27

Decreased macula densa [NaCl] will result in ____ to afferent arterioles and release of _____ from JG cells.

dilation; renin

28

Bladder stretch receptors send signals to the sacral region of the SC via ______, and the signals are conducted back to the bladder via _______.

pelvic nerves;
parasympathetic nerves