Urinary (Renal) System

Pregunta	Respuesta
Excretion	separation and elimination of wastes from body fluids
Respiratory system excretes:	CO2 (carbon dioxide), H20 (water), and other gases
Integumentary system excretes:	water, salts, lactic acid, urea
Urinary (Renal) system excretes :	metabolic wastes, toxins, drugs, hormones, salts, H+, water
Digestive system excretes:	water, bile, mucus, & enzymes
1. Kidneys produce...	urine (1)
2. Ureters transport...	urine (2)
3. Urinary bladder...	stores urine (3)
4. Urethra passes...	urine to outside (4)
Glomerular Filtration	water, salts, nutrient molecules, and waste molecules move from the glomerulus to the inside of the glomerulus capsule. These small molecules are called the glomerular filtrate.
Tubular Reabsorption	Nutrient and salt molecules are actively reabsorbed from the convoluted tubules into the peritubular capillary network, and water flows passively.
Tubular Secretion	Certain molecules (i.e. H+ and penicilin) are actively secreted from the peritubular capillary network into the convoluted tubules.
Regulatory functions of kidneys:	1. Water-Salt Balance: Most (99%) of the water filtered through kidneys is reabsorbed into the blood 2. Salt (NaCl) is reabsorbed or eliminated depending on concentration in the blood, blood pressure (subject to hormonal control)
Substances excreted in urine:	1. Water 2. Sodium 3. Urea 4. Chemical breakdown products of drugs 5. Glucose (in uncontrolled diabetes)
Where is urea produced?	in the liver
What is urea used for?	transportation of nitrogenous wastes of dietary protein metabolism, in blood
When is creatinine produced?	When Muscle tissue is broken down
How and where is creatinine filtered?	freely filtered in the kidney tubules (not subjected to active secretion or re-absorption)
Loop of the Nephron	- the part of the tubule which dips from the cortex into the medulla (descending limb), then returns to the cortex (ascending limb). - part of tubule where urine is concentrated if necessary
Ascending limb	In, Loop of the Nephron, the part of the tubule which returns to the cortex
Descending limb	In, Loop of the Nephron, the part of the tubule which dips from the cortex into the medulla
Collecting duct	- The final concetration of urine
Kidney function	d
Kidney parts	d
Cortex (Outer part of kidney)	filters blood
Medulla (inside kidney)	where salt and water content in urine in controlled
Nephron (inside kidney) function	- Remove excess water, wastes and other substances from your blood. - Return substances like Na, K, or P whenever any of these substances run low in your body.
Nephron Structure

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	Creado por Mischa Cole hace alrededor de 8 años