HOMEOSTASIS: URINE FORMATION

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HOMEOSTASIS: URINE FORMATION by Mind Map: HOMEOSTASIS: URINE FORMATION

1. Ultrafiltration

1.1. -Takes place in the glomerulus and the bowman's capsule

1.2. -Occur due to the hydrostatic pressure caused by the blood pressure

1.3. -blood enters the glomerulus via afferent arteriole and leaves via afferent arteriole

1.3.1. -produce high hydrostatic pressure

1.3.2. -forces small molecule through the walls of capillaries and bowman's capsule into the capsular space

2. Reabsorption

2.1. -the process of absorbing useful substance from the tubule into capillaries which wrapped around tubule

2.2. -Occurs in:

2.2.1. 1.Proximal convoluted tubule -most reabsorption occurs over 80 percents

2.2.2. 2.Loop of Henle -to create a water potential gradient between the filtrate and the interstitial fluid in the medulla

2.2.3. 3.Distal convoluted tubule -receives a hypotonic filtrate from the ascending limb -not permeable to water but depends on hormonal control -Active reabsorption of Na+ under hormonal control that is aldosterone

2.2.4. 4. Collecting duct -the collecting duct carries the filtrate from cortex to medulla to the renal pelvis -permeability to water and urea is under hormonal anti diuretic hormone(ADH) control

3. Secretion

3.1. -from blood capillaries to the tubule

3.2. -Occurs in the distal tubule and the proximal convoluted tubule

3.3. -Distal tubule secrets H+ and NH3 from the blood into the filtrate

3.4. -Secretion of K+ occurs under hormonal control by aldosterone

3.5. -Proximal & distal tubule also actively secretes harmful or toxic substances into the filtrate