pages 511-516. urine for a great time today!!!
TRANSCRIPT
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Pages 511-516
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URINE for a great time today!!!
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Elimination of waste products which include: Nitrogenous wastes Toxins Drugs
Regulation of homeostatic factors such as: Water, acid/base, electrolyte balance BP RBC mfr Vitamin D activation
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Kidneys (contain the nephron) Ureters Urinary bladder Urethra
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Hepatic veins (cut)
Inferior vena cava
Adrenal gland
Aorta
Iliac crest
Rectum (cut)
Uterus (partof femalereproductivesystem)
(a)
Renal arteryRenal hilumRenal vein
Kidney
Ureter
Urinarybladder
Urethra
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Location and structure against the dorsal body wall at the level of the T12 to L3 vertebrae right kidney is slightly lower than the left
It is crowded by the liver renal hilum
medial indentation where structures enter or exit the kidney (ureters, renal blood vessels, and nerves)
An adrenal gland sits atop each kidney
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12th rib
(b)
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Protective tissue structures: (from deep to superficial) Enclosed by a fibrous connective tissue
capsule Lies directly on the kidney Protects from infection
Perirenal fat capsule surrounds the kidney and cushions against blows
Renal fascia is the outermost capsule anchors the kidney and adrenal gland to surroundings
Pararenal fat capsule surrounds renal fascia
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Three kidney regions1. Renal cortex—outer region2. Renal medulla—deeper region
Renal (medullary) pyramids—triangular regions of tissue Renal columns—extensions of cortex-like material
separate the pyramids
3. Renal pelvis—medial region; flat, funnel-shaped tube Calyces—extensions of the renal pelvis
enclose the renal pyramids collect urine and send it to the renal pelvis>ureter>urinary bladder
Nephrons comprise the bulk of cortex and medulla
and are made of specialized endothelial and/or epithelial tissues
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Renal column
Renal cortex
Major calyx
(a)
Minor calyx
Renalpyramid
Longitudinal section of the right kidney
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Renal column
Renal cortex
(b)
Minor calyx
Fibrous capsule
Renalpyramid
Cortical radiate vein
Cortical radiate artery
Arcuate vein
Arcuate artery
Interlobar vein
Interlobar artery
Segmental arteries
Renal vein
Renal artery
Renal pelvis
Major calyxUreter
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One-quarter of the total blood supply of the body passes through the kidneys each minute
The abdominal aorta supplies the renal artery Renal artery
provides each kidney with arterial blood supply Renal artery divides into smaller vessels
Renal vein Smaller vessels get bigger to supply renal vein Renal vein returns blood to the inferior vena cava
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Renal column
Renal cortex
(b)
Minor calyx
Fibrous capsule
Renalpyramid
Cortical radiate vein
Cortical radiate artery
Arcuate vein
Arcuate artery
Interlobar vein
Interlobar artery
Segmental arteries
Renal vein
Renal artery
Renal pelvis
Major calyxUreter
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Responsible for forming urine
Two main structures of a nephron:1. Renal corpuscle – includes:
1. glomerulus, Bowman’s capsule, podocytes
2. Renal tubule – includes:1. proximal convoluted tubule2. Loop of Henle3. distal convoluted tubule
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Renal cortex
Renal medulla
Renal pelvis
Renal cortex
Ureter
Renal medulla
Cortical nephron Fibrous capsule
Juxtamedullarynephron
Collectingduct
Proximalconvoluted tubule
Glomerulus
Distalconvoluted tubule
Nephron loop
(a)
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2 locations for nephrons: Cortical nephrons
Located entirely in the cortex Include most nephrons
Juxtamedullary nephrons Found at the boundary of the cortex and
medulla Nephron loop dips deep into the medulla
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Renal cortex
Renal medulla
Renal pelvis
Renal cortex
Ureter
Renal medulla
Cortical nephron Fibrous capsule
Juxtamedullarynephron
Collectingduct
Proximalconvoluted tubule
Glomerulus
Distalconvoluted tubule
Nephron loop
(a)
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Each nephron has two capillary beds:1. Glomerulus
1. fed and drained by the afferent/efferent arterioles
2. High pressure - for filtration
2. Peritubular capillaries1. Drains the glomerulus2. Low pressure and porous - for absorption
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PCTGlomerularcapsular space
Glomerular capillarycovered by podocytes
Efferent arteriole
Afferentarteriole
(c)
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Filtration slits
Podocytecell body
Footprocesses
(d)
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Peritubularcapillaries
Glomerularcapillaries
Glomerular(Bowman’s)capsule
Efferent arteriole
Afferent arteriole
Cells of thejuxtaglomerularapparatusCortical radiatearteryArcuate artery
Cortical radiatevein
Arcuatevein
Distalconvolutedtubule(DCT)
Proximal convolutedtubule (PCT)
(b)
Collecting duct
Nephron loop