powerpoint presentation on urinary system

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THE URINARY SYSTEM - PowerPoint PPT Presentation

THE URINARY SYSTEM

The urinary system functions of the urinary system 1. excretion removing nitrogenous wastes, certain salts, and excess water from blood 2. – powerpoint ppt presentation.

• 1. Excretion removing nitrogenous wastes, certain salts, and excess water from blood
• 2. Maintain acid-base balance
• 3. Secrete waste products in the form of urine
• Eliminate urine from blodder
• 2 bean shaped organs that are about 4 inches long by 2-3 inches wide by 1 inch thick.
• Left is slightly larger and higher
• Located between peritoneum and the back muscles are protected by the lower ribs (RETROPERITONEAL)
• HILUM indentation along concave medial border is where the lymph vessels, nerves, blood vessels, and ureter enter the kidney
• Blood brought to kidney the renal artery branch off the aorta
• Renal artery subdivides into smaller branches which make contact with nephrons
• Blood leaves via the renal vein which connects to inferior vena cava
• Kidney is divided into 2 regions
• Renal cortex is the outer portion of the kidney
• Renal Medulla contains the tubes in which urine is formed and collected
• Tubes in the medulla form a number of cone-shaped structures call renal pyramids
• Tips of pyramids point toward the renal pelvis a funnel shaped basin that forms the upper end of the ureter
• The base of each renal pyramid faces cortex, while apex empties into cuplike cavities which collect urine called calyces
• Urine that collects in the pelvis, then passes down the ureters to the bladder.
• Functional unit of kidney - urine making units.
• 1 million microscopic units per kidney
• They purify blood by removing waste substances and also control the amount of water and salt in blood
• One tube from each kidney (15 to 18 inches long)
• Carry urine from renal pelvis of kidney to bladder
• One inch of the ureter enters the bladder at an angle
• A full bladder compresses the ureter and prevents the backflow of urine
• Smooth muscle tube with mucus membrane lining
• Urine enters the ureters every 10 to 30 seconds in spurts due to peristaltic movement and gravity
• Muscular sac that receives and stores urine
• Made of elastic fibers and involuntary muscle
• Lines with rugae
• Stores urine usually about 500 cc
• Emptying urine (voiding) is involuntary but controlled through nervous system (voluntary)
• Micturate empty bladder (void, urinate.)
• Canal for the excretion of urine from the body.
• Urine leaves through URETHRA to outside opening URINARY MEATUS
• Female 1 to 1½ inches long urinary meatus located between the clitoris and the vagina
• Male 8 inches long, passes from the bladder through the prostate gland and the penis ot the meatus located at the end of the penis carries both urine and semen
• Renal corpuscle is subdivided into Bowmans capsule and the glomerulus
• Bowmans capsule cup-shaped top of the nephron that surrounds the glomerulus
• Blood flows into the glomerulus through the afferent arterioles and leaves the glomerulus through the efferent arterioles
• In the Glomerulus the high-pressure, leaky capillaries ooze a fluid (glomerular filtrate) similar to blood plasma minus most proteins
• Next 4 segments are known as the renal tubule
• Proximal convoluted tubule filtrate flows here next where the majority of reabsorption takes place via active transport
• Next is the Loop of Henle -note it consists of a straight descending limb, a hairpin loop, and a straight ascending limb
• The Distal Convoluted tubule is a major site of secretion of ions (potassium)
• Collecting tubule straight part of the renal tubule Urine from the collecting tubules exits from the pyramids and enter the calyces and renal pelvic.
• The renal corpuscles and both proximal and distal convoluted tubules are in the cortex of the kidney
• The medulla contains the loop of Henle and collecting tubules.
• 1 Filtration
• 2 Reabsorption
• 3 - Secretion
• First step in urine formation
• Blood from renal artery enters glomerulus
• High blood pressure in glomerulus forces fluid (FILTRATE) to filter into Bowmans capsule
• Filtrate does not contain plasma proteins or RBCs theyre too big
• Bowmans capsule filters out 125cc of fluid/min 7500 cc/hr - 180 liters/day
• As filtrate continues through nephron, 90 of water is reabsorped.
• H20 and useful substances
• are reabsorbed (moves substances out of the urine into the blood)
• Begins in the proximal convoluted tubules and continues in the loop of Henle, distal convoluted tubules, and collecting tubules
• If blood levels of certain substances are high (glucose, amino acids, vitamins, sodium) then those substances will not be reabsorbed (THRESHOLD)
• Opposite of reabsorption (moves substances out of the blood into the urine)
• Secretion transports substances from blood into collecting tubules
• Substances include creatinine, hydrogen ions, potassium ions, and some drugs
• Electrolytes are selectively secreted to maintain acid-base balance
• Average urine output 1500 ml/day
• Anuria absence of urine
• Oliguria scanty amounts of urine
• Polyuria an unusually large amount of urine
• Nocturia frequent urination at night

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Urinary System

Mar 31, 2019

710 likes | 1.14k Views

Urinary System. Consists of: . Kidney(s) Ureters Urinary Bladder Urethra. Functions:. Filter gallons of fluid from bloodstream Filter plasma 60 times/day Responsible for removing: Toxins Metabolic Wastes Excess ions. Regulates volume and chemical make up of blood

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Presentation Transcript

Consists of: • Kidney(s) • Ureters • Urinary Bladder • Urethra

Functions: • Filter gallons of fluid from bloodstream • Filter plasma 60 times/day • Responsible for removing: • Toxins • Metabolic Wastes • Excess ions • Regulates volume and chemical make up of blood • Maintains the proper pH between water, salts, acids and bases • Maintains blood pH between 7.35 – 7.45

Functions • Regulatory functions include: • Produce hormones Renin and erthropoietin • Renin helps regulate BP and kidney function • Erthropoietin stimulates RBC production in bone marrow • Assists in metabolizing Vitamin D to its active form.

Kidney Anatomy Medulla • Kidneys are covered by fatty tissue; anchors kidneys to posterior wall • Internal Anatomy – 3 distinct regions • Pelvis – where kidneys join ureters; responsible for collecting urine • Renal Cortex – outer region; most of nephrons are found here • Medulla – Middle region; Renal pyramids

Nephron – Working Unit of Kidney; Carry out processes that form urine Cortex Medulla

Nephron • Glomerulus – tuft of capillaries • Parts of Nephron • Bowman’s capsule • Renal Tubule - 3 cm in length • Proximal Convoluted tubule (PCT) • Loop of Henle • Distal Convoluted tubule (DCT) • Collecting Duct

Urine Formation Involves 3 processes Filtration glomerulus and Bowman’s capsule Renal Reabsorption Carried out by renal tubules Secretion Carried out by renal tubules

Glomerular Filtration • Blood enters via afferent arteriole (larger diameter) and leaves via the efferent arteriole • Difference in vessel diameter increases BP in glomerulus and assists with filtration

Podocytes (Bowman’s capsule) – surround capillaries • Passive, nonselective process where fluids and solutes are passed through a membrane • Force is cause by hydrostatic pressure • What caused pressure increase?

GFR (Glomerular filtration rate) is the amount of filtrate produced in the kidneys in one minute. • Renin regulates GFR by causing an increase in blood volume and blood pressure (Constricts blood vessels)

Filtration Pressure – Increase in BP at glomerulus forces water and solutes out of blood and into capsule. • What passes through? What remains in the blood? Filtrate is not Urine

Filtrate contains both wastes and needed water and solutes • Reabsorbion begins as soon as nutrients enters the PCT • All water can’t be excreted, so tubules claim what it needs • Why is it called reabsorption and not absorption?

What is reabsorbed? • 100 % of organic nutrients • Most electrolytes by facilitated diffusion • Water is passively reabsorbed • 60 – 70 % of fluid is reaborbed by PCT Rate and degree of reabsorption is regulated by hormones Problems: Hyperglycemia

Where does Reabsorption occur in the nephron? • PCT are most active reabsorbers • The descending loop of Henleis permeable to water but not solutes • The ascending loop of Henleis impermeable to water and most solutes • Na and Cl are actively reabsorbed into the blood stream • DCT is impermeable to solutes • Reabsorption of Na, K, and water is controlled by hormones

Milliosmols Na+ (65%) Glucose Amino acids H2O (65%) and many ions (e.g. Cl– and K+) Cortex (d) (a) 300 (e) Outer medulla (b) (c) 600 Some drugs HCO3– H+, NH4+ Inner medulla Blood pH regulation (a) Proximal convoluted tubule: • 65% of filtrate volume reabsorbed • Na+, glucose, amino acids, and other nutrients actively transported; H2O and many ions follow passively • H+ and NH4+ secretion and HCO3–reabsorption to maintain blood pH • Some drugs are secreted 1200 Active transport (primary or secondary) Passive transport Figure 25.18a

Reabsorption (b) The descending loop of Henle • Freely permeable to H2O • Not permeable to NaCl or other solutes • Filtrate becomes increasingly concentrated as H20 leaves by ____________? Active transport (primary or secondary) Passive transport

Milliosmols Cortex Na+ (d) Cl– (a) K+ 300 (e) Outer medulla (b) Urea Na+ (c) Cl– 600 Inner medulla (c) Ascending limb of loop of Henle • Impermeable to H2O • Permeable to NaCl • Filtrate becomes increasingly dilute as salt is reabsorbed 1200 Active transport (primary or secondary) Passive transport Figure 25.18c

Osmolality of interstitial fluid (mOsm) Filtrate entering the loop of Henle is contains many substances that are needed in the body H2O NaCI Cortex Active transport Passive transport NaCI H2O Water impermeable NaCI H2O NaCI H2O The descending limb: • Permeable to H2O • Impermeable to NaCl As filtrate flows, it becomes increasingly concentrated as H2O leaves the tubule by osmosis. The filtrate osmolalityincreases. Outer medulla H2O NaCI H2O H2O Inner medulla Loop of Henle The ascending limb: • Impermeable to H2O • Permeable to NaCl Filtrate becomes increasingly dilute as NaCl leaves, eventually becoming hypo-osmotic to blood . NaCl leaving the ascending limb increases the osmolality of blood. Figure 25.16a

What’s left in the nephron? • Non-reabsorbed substances are: • Urea – 50 % is reclaimed; the rest is waste • Creatinine – a large lipid; insoluble molecule that is not reabsorbed at all • Uric Acid – 50 % is reclaimed; waste product of RNA synthesis

Tubular Secretion – “Reabsorption in Reverse” • Urine is formed from filtered and secreted substances • Secretion occurs in the DCT tubules and collecting ducts • Hormones assist with this process • ADH (antidiuretic hormone) • Aldosterone • ANP

Na+; aldosterone-regulated Ca2+; PTH-regulated Cl–; follows Na+ Milliosmols Cortex (d) (a) 300 (e) Outer medulla (b) (c) 600 Inner medulla (d) Distal convoluted tubule • Na+reabsorption regulated by aldosterone • Ca2+reabsortion regulated by parathyroid hormone (PTH) • Cl–cotransported with Na+ 1200 Active transport (primary or secondary) Passive transport Figure 25.18d

Milliosmols Cortex H2O regulated by ADH (d) (a) 300 Regulated by aldosterone: Urea; increased by ADH (e) Na+ Outer medulla (b) K+ Blood pH regulation (c) 600 H+ HCO3– Inner medulla NH4+ 1200 (e) Collecting duct • H2O reabsorptionregulated by ADH • Na+reabsorption and K+ secretion regulated by aldosterone • H+ and HCO3–reabsorption or secretion to maintain blood pH • Urea reabsorption increased by ADH Why? Active transport (primary or secondary) Passive transport Figure 25.18e

Substances that are not reabsorbed • Substances that lack carry proteins along membrane • Urea • Uric acid • Substances that are not lipid soluble • Substances that are too large to pass • Creatinine

1 Label the parts of the nephron Describe what is occurring at sections 1-6. 1. 2. 3. 4. 5. 6. 5 2 6 4 3

Hormonal Control of Secretion • Osmolarity – number of solute particles dissolved in one liter of water Affects osmosis • Kidneys are responsible for regulating solute concentrations in the body; the concentration of urine is regulated by hormones • Four Hormones Control Kidney Function • Renin • Aldosterone • AtrialNatiuretic Peptide (ANP) • Antidiuretic hormone (ADH)

Renin • Released when glomerular pressure is low • Causes blood vessels to constrict; raising blood pressure in arteries • The efferent arteriole constricts which increases glomerular pressure • Stimulates secretion of ADH and aldosterone

Aldosterone • Released by adrenal glands • When secreted causes Na+to be reabsorbed from DCT • H20 follow Na+, so both Na+ and H2O are reabsorbed • Eliminates K+ into urine • Stimuli that cause the release of aldosterone • Decreased blood volume • Decreased sodium in blood • Increased potassium in blood (heart block)

If too much aldosterone is secreted:- Excessive Na+ and H20 retention (edema, hypertension- Accelerated secretion of K ions (muscle responsiveness)

Lasix – (Diuretic) inhibits Na from being reabsorbed; thus water is not reabsorbed.

AtrialNatiuretic Peptide (ANP) • Works against aldosterone • Released by atrial cardiac cells when blood volume and BP are too high. • Why would the atrial cells detect a change in blood volume? • When ANP is secreted: • CausesNa+ to be dumped into tubules (urine) • H2Ofollows sodium into urine • Capillaries in glomerulus dilate; increasing blood flow to Bowman’s capsule; increasing UO • Inhibits the secretion of renin, aldosterone and ADH • Urine contains more Na+H2O; blood pressure and blood volume decrease

ADH (Antiduretic hormone) • When ADH is secreted, water is reabsorbed from DCT and collecting tubules • Person feels thirsty • When ADH is not secreted, DCT and collecting tubules are impermeable to water, no reabsorption occurs here.

Concentration of Urine is controlled by ADH • Dilute Urine • Na and other ions are removed from filtrate • Urine appears clear in color • Concentrated Urine • ADH is secreted; distal and collecting tubules reabsorb water • When water leaves filtrate; urine concentration increases Without use of hormones, DCT and collecting duct are relatively impermeable to water and sodium

Work of the Nephron with Hormone Secretion

Diuretics – chemicals which increase UO • Any substance that is not reabsorbed and carrries water out of body • Alcohol – inhibits ADH • Caffeine – Increases filtration rate (GFR) • Diuretic drugs are taken for CHF, edema and to increase UO

Active transport Passive transport Collecting duct Descending limb of loop of Henle DCT Cortex NaCI H2O NaCI Outer medulla NaCI Urea H2O Inner medulla Large volume of dilute urine (a) Absence of ADH Figure 25.17a

Maintaining a Balance • Other Systems assist in excretion and affect kidney function • Integumentary • Respiratory • Digestive • Fluid and Electrolyte Balance • Water into body = Water out of the body • Neither a net gain or loss of electrolytes should occur in body • Acid-Base Balance • Blood pH ranges between 7.35 – 7.45 • Kidneys will secrete H+ ions when blood pH drops

Imbalances • Acidosis – Blood pH drops below 7.35 • Respiratory Acidosis • Due to an increase of CO2 levels in body • Metabolic Acidosis • Due to cell metabolism in the body • Lactic acid in muscle metabolism • Ketone bodies by the breakdown of fat • Diabetics don’t use glucose due to lack of insulin; so cells will break down fat instead Blood ph < 7.05 disrupts the stability of cell membrane, alters protein function (enzyme), causes heart arrhythmias and leads to coma

Kidney Stones • Hardened mineral deposits that form in kidney • Symptoms • Blood in urine • Increased need to go • Nausea and vomiting • Pain during urination • Tenderness in abdomen and kidney region • Treatment • Lithotripsy • Medication

Renal Failure – Kidney Failure • Nephrons in kidney stop functioning • Unable to filter or excrete waste • Can’t regulate composition of body fluids • Can’t control erythrocyte function or blood pressure • Can’t control salt balance

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