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PWA Unit 4 Chapter 9
Excretion and the Interaction of Systems
26
Biology
11th Grade
03/09/2009

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Term
Antidiuretic Hormone (ADH)
Definition
hormone regulated by the hyphothalamus and released by the pituitary gland that increases the permeability of the distal tubule and the collecting duct in the nephrons of the kidneys, allowing more water to be reabsorbed into the blood from the filtrate (9.3)
Term
Bowman's Capsule
Definition
in the kidney, cap-like formation at the top of each nephron that serves as a filtration structure; surrounds the glomerulus (9.1)
Term
Collecting Duct
Definition

in the kidneys, large, pipe-like channel arising from the tubule connected to the Bowman's capsule in the nephron; functions as a water-conservation device, reabsorbing water from the filtrate in the nephron (9.1)

Term
Diabetes Insipidus
Definition

a disorder characterized by excessive thirst, weakness, and heavy and frequent urination due to insufficient levels of anti-diuretic hormone (ADH)

(9.3)

Term
Distal Tubule
Definition
in the kidney, tubular portion of the nephron that lies between the loop of Henle and the proximal tubule; main function is reabsorption of water and solutes, and secretion of various substances (9.2)
Term
Excretion
Definition
process of separating wastes from body fluids and eliminating them from the body; performed by several body systems, including respiratory (excretes carbon dioxide and small amounts of other gases, including water vapour), skin(excretes water, salts, and some urea in perspiration), digestive (excretes water salts, lipids, and a variety of pigments and other cellular chemicals), and excretory (excretes metabolic wastes that are dissolved or suspended in solution) systems (9.1)
Term
Excretory System
Definition
in animals, the system that regulates the volume and compostion of body fluids by excreting metabolic wastes and recycling some substances for reuse, main organs include the kidneys, ureters, bladder, and urethra; also known as the urinary system (9.1)
Term
Filtrate
Definition
in the kidney, filtered fluid that proceeds from the glomerulus into the Bowman's capsule of the nephron (9.1)
Term
Glomerular Filtration
Definition

in the kindey, process that results in the movement of water and solutes, except protein, from the blood plasma into the nephron down a pressure gradient

(9.2)

Term
Glomerlus
Definition
in the kidney, a fine network of capillaries withing the Bowman's capsule of the nephron; arising from the renal artery, the walls of the glomerlus act as a fliltration device (9.1)
Term
Hemodialysis
Definition
type of renal (kidney) dialysis that utilizes an artificial membrane in an external device and is connected to an artery and a vein in a person's arm to remove waste and excess fluid from the blood when kidney function is lost due to a renal failure (9.3)
Term
Loop of Henle
Definition
 in the kidney, tubular portion of the nephron that lies between the proximal tubule and the distal tubule; main function is reabsorption of water and ions (9.2)
Term
Nephron
Definition
microscopic tube-like filtration unit found in the kidneys that filters and reabsorbs various substances from the blood; produces urine (9.1)
Term
Osmoreceptor
Definition
cell that is sensitive to osmotice pressure; most are located inthe hypothalamus of the brain (9.3)
Term
Peritoneal Dialysis
Definition
type of renal (kidney) dialysis that utilizes the lining of the intestines, called the peritoneum, as the dialysis membrane to remove waste and excess fluid from the blood when kidney function is lost due to renal failure (9.3)
Term
Proximal Tubule
Definition
in the kidney, tubular portion of the nephron that lies between the Bowman's capsule and the loop of Henle; main function is reasborption of water and solutes, as well as secretion of hydrogen ions (9.2)
Term
Renal Artery
Definition
blood vessels that orginates from the aorta and delivers blood to the kidneys; splits into a fine network of capillaries (the glomerulus) within the Bowman's capsule of the nephron (9.1)
Term
Renal Insufficiency
Definition
general term used to describe the stae in which the kidneys cannot maintain homeostasis due to nephron damage (9.3)
Term
Renal Vein
Definition
blood vessel that drains from the kidney; returns to the body the solutes and water reabsorbed by the kidney (9.1)
Term
Tubular Reabsorption
Definition
in the kidney, process in which water and useful solutes are reabsorbed from the filtrate in the nephron and transported into capillaries for reuse aby the body (9.2)
Term
Tubular Secretion
Definition
in the kidney, process that moves additional wastes and excess substances from the blood into the filtrate in the nephron; uses mainly active transport (9.2)
Term
Ureter
Definition
in mammals, a pair of muscular tubes that carry urine from the kidneys to the bladder (9.1)
Term
Urethra
Definition
the tube through which urine exits the bladder and the body (9.1)
Term
Urinary Bladder
Definition
organ where urine is stored before being discharged by the way of the urethra (9.1)
Term

Urine

Definition
in the kidneys, filtrate of the nephron upon leaving the collecting duct; exits the body through the urethra (9.2)
Term
Water Reabsorption
Definition
in the kidney, process which removes water from the filtrate in the nephron and returns it to the blood for reuse by body systems (9.2)
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