urinary - Urinary System I Kidney anatomy II Kidney...

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Urinary System I. Kidney anatomy II. Kidney physiology: mechanisms of urine formation III. Regulation of urine concentration and volume IV. Ureters, urinary bladder, and urethra Urination Overview
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Kidney Functions Regulate blood volume Regulate the chemical make-up of blood Produces renin, erythropoietin Metabolism of vitamin D Gluconeogenesis Break down the words: Gluco-neo-genesis (glucose production from non-carbohydrate precursors (e.g., amino acids, fatty acids) during prolonged fasting
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Urinary System Anatomy Figure 25.1a Are kidneys attached by a mesentary or retroperitonial? Which kidney is lower? What may be pushing it down?
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Kidney Location and External Anatomy Convex Lateral surface Concave Medial Surface renal hilus , which opens into a space called the renal sinus Enter / Exit Point
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Internal Anatomy 1. Renal cortex – outer portion, urine formation forms here 2. Renal medulla – inner tissue -Renal pyramids – base of each pyramid faces the cortex, and apex of each (renal papilla) projects into renal sinus -Renal Columns- seperates pyramids from each other, extensions of cortical tissue 3. Renal pelvis is a flat funnel-shaped tube that is continuous with the ureter. - Within the kidney, the renal pelvis divides into several major calyces . - Each major calyx divides into several minor calyces . The tip of each minor calyx surrounds a renal papilla.
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Figure 25.3b URINE FLOW (basic) : Urine is formed in the renal cortex Travels thru collecting ducts in the renal medulla Continuously drips out of the renal papillae Into the minor calyces Flows into major calyces Flows into the renal pelvis Flows into the ureter Flows into and is stored in the urinary bladder Exits the body via the urethra.
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Kidney Stones
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Supportive Tissue Layers Around Kidney 1. Renal capsule – innermost, fibrous structure that prevents kidney infection 2. Adipose capsule – fatty mass Cushions it against blows and holds in place 3. Renal fascia – outer layer of dense fibrous connective tissue Anchors kidney and adrenal gland to surrounding structures
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Renal Capsule Adipose Capsule Renal fascia Renal fascia 1. Renal capsule 2. Adipose capsule 3. Renal fascia
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Nerve and Blood Supply Sympathetic Nervous System – regulate renal blood flow – adjust diameter of arterioles-regulate blood flow Kidneys receive 20-25% of CO at rest Blood Flow
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Nephrons Structural and functional unit of kidney Renal Corpuscle - consists of: Bowman’s Capsule- spherical chamber Glomerulus - bed of capillaries Blood enters glomerulus via afferent arteriole Urine formation begins as blood pressure forces fluid from the blood in glomerulus through fenestrated capillaries into capsular space (FILTRATION) Renal Tubule – consists of: Proximal convoluted tubule (PCT) -first segment of renal tubule Cuboidal epithelium with microvilli lines the lumen and absorbs desired molecules from the tubular fluid back into the tissues
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This note was uploaded on 02/26/2011 for the course BIO 107 taught by Professor Smith during the Spring '11 term at NE Texas CC.

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urinary - Urinary System I Kidney anatomy II Kidney...

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