Urinary System Chapter 25
Order by
40 terms
Terms | Definitions |
|---|---|
 Excretion | the removal of organic waste products from body fluids |
| Elimination | the discharge of waste products into the environment |
| Structures of the Urinary System | kidneys ureters urinary bladder urethra |
| Female Urethra | is short (1.5 inches) is used solely by the urinary system |
| Male Urethra | is long (8 inches) is shared by the urinary and reproductive system |
| Divisions of Male Urethra | 1. prostatic 2. membranous 3. penile |
| Kidney Position | retroperitoneal left is slightly superior than the right |
| Hilus | entrance for the renal artery and renal nerves exit for renal veins and ureter |
| Nephrons | site of urine formation return filtered blood to venuoles |
| Ureters | carry urine to the bladder |
| Afferent arterioles | feed into nephrons |
| Efferent arterioles | connects two capillary beds |
| Nephron is composed of | 1. renal corpuscle 2. renal tubule |
| Renal corpuscles is composed of | 1. Bowman's capsule 2. glomerulus |
| Renal Tubule is composed of | 1. proximal convoluted tubule (PCT) 2. loop of Henle 3. distal convoluted tubule (DCT) |
| Two types of Nephron | cortical nephron juxtamedullary nephron |
| Cortical Nephron | makes up 85% of nephrons located in the renal cortex |
| Juxtamedullary Nephron | makes up 15% of nephrons located near the renal medulla |
| Visceral epithelium consists of | podocytes |
| Filtration slits | tiny gaps between pedicels |
| Portions of Renal Tubules | proximal convoluted tubules loop of Henle distal convoluted tubule |
| Substances are ______ ______ of the blood at the __________ capillaries in the renal corpuscle | filtered out glomerular |
| Substances are selectively _________ into the blood at the __________ capillaries around the tubules | reabsorbed peritubular |
| The Loop of Henle consists of | a descending and ascending limb |
| The Loop selectively reabsorbs | Na+, Cl-, and H2O |
| DCT secretes | toxins and drugs from blood into tubular fluid |
| Urine production by the kidneys maintains homeostasis by... | regulating blood volume excreting urea, creatinine, and uric acid |
| GFR | Glomerular Filtration Rate-the amount of filtrate produced in the kidneys each minute |
| Low GFR stimulates | the release of renin from the kidneys (which stimulates ADH and aldosterone...fight or flight...retention of water at kidneys) |
| What occurs ONLY in the renal corpuscle? | filtration |
| The PCT reabsorbs how much of the filtrate produced? | 60-70% |
| Countercurrent multiplication | creates an osmotic gradient in the medulla |
| Descending limb is permeable | to water but not ions |
| Ascending limb is permeable | to ions but not water |
| Water and solute loss is regulated by what? | ADH |
| Urinalysis | is the chemical and physical analysis of urine |
| Peristaltic contractions | force urine bolus from the kidney to the bladder |
| Urinary Bladder | hollow, muscular organ that serves as a reservoir for storing urine until elimination |
| Urethra | tube extending from the urinary bladder to exterior of the body |
| Mictarition Reflex | controls urination |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.