Date post: | 07-Apr-2017 |
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Health & Medicine |
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A male patient, age 60 presents to medical OPD with the complaints of Body Swelling, generalized weakness and anorexia. He is diabetic and hypertensive for the last about 5 years.On examination and investigations, it was found that he was having:1.Edema2.Metabolic acidosis3.Increased levels of Urea, Potassium, creatinine and uric acid4.Anemia5.Osteomalacia 6.Hypertension ©Prof. Dr. Rashid Mahmood 1
What is the probable Cause/ Diagnosis?
Prof. Dr. Rashid mahmood
3 ©Prof. Dr. Rashid Mahmood3
OBJECTIVES• Goal /Aim
– By the end of this session students should be able to understand the Basic Concepts of Functional characteristics of nephron
• Specific objectives• At the end of the lecture students should be able to
• Describe the Functions of the Kidneys • Outline Physiologic Anatomy of the Kidneys and Nephron• Describe The nephron as the functional unit of the kidney• Differentiate between Cortical and juxtamedullary
nephron
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Lesson contents• Multiple Functions of the Kidneys in Homeostasis
– Excretion – Regulation of water and electrolyte balance– Regulation of arterial pressure– Regulation of acid-base balance– Regulation of erythrocyte production– Regulation of 1,25-Dihydroxyvitamin D2 production– Glucose synthesis
• Physiologic Anatomy of the Kidneys– General organization of the kidneys and urinary tract– Renal blood supply– The nephron is the functional unit of the kidney– Regional differences in nephron structure: Cortical and juxtamedullary nephron
©Prof. Dr. Rashid Mahmood
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5 ©Prof. Dr. Rashid Mahmood5
OBJECTIVES• Goal /Aim
– By the end of this session students should be able to understand the Basic Concepts Functional characteristics of nephron
• Specific objectives• At the end of the lecture students should be able to
• Describe the Functions of the Kidneys • Outline Physiologic Anatomy of the Kidneys and Nephron• Describe The nephron as the functional unit of the kidney• Differentiate between Cortical and juxtamedullary
nephron
6 ©Prof. Dr. Rashid Mahmood 6
FUNCTIONS OF KIDNEY• Primary function• REGULATORY FUNCTIONS• EXCRETORY FUNCTIONS• SECRETORY/ENDOCRINE
FUNCTIONS • OTHER FUNCTIONS
7 ©Prof. Dr. Rashid Mahmood 7
Functions of kidney• Primary function
1. Maintenance of the normal volume and composition of body fluids2. To get rid of body waste
materials
8 ©Prof. Dr. Rashid Mahmood 8
Functions of kidney1. REGULATORY FUNCTIONS (Maintenance of Homeostasis)
i. Regulation of water balanceii. Regulation of electrolyte concentrationiii. Regulation of acid-base balanceiv. Regulation of arterial pressure
i. Long-term: salt and water excretionii. Short-term: renin
v. Regulation of blood volume
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Functions of kidney2. EXCRETORY FUNCTIONS
i. Excretion of metabolic waste productsUrea, creatinine, uric acid, bilirubin etc
ii. Excretion of drugs, hormone metabolites
iii. Excretion of foreign chemicals. ToxinsPesticides, food additives etc
--contd--
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Functions of kidney3. SECRETORY/ENDOCRINE
FUNCTIONS (Hormonogenesis)i. Erythropoietinii. Vitamin D-3 (1,25-dihydroxyvitamin
D3; calcitriol)iii. Renin
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Functions of kidney3. Other FUNCTIONS
i. Gluconeogenesisii. Detoxification of free radicals and drugs
(Peroxisomes)iii. PROSTAGLANDIN Synthesis and
metabolism i. Dilatation of blood vesselsii. Water and sodium excretioniii. Autoregulation of renal blood flow
16 ©Prof. Dr. Rashid Mahmood16
OBJECTIVES• Goal /Aim
– By the end of this session students should be able to understand the Basic Concepts Functional characteristics of nephron
• Specific objectives• At the end of the lecture students should be able to
• Describe the Functions of the Kidneys • Outline Physiologic Anatomy of the Kidneys and Nephron• Describe The nephron as the functional unit of the kidney• Differentiate between Cortical and juxtamedullary
nephron
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Physiological anatomy
• One million nephrons in each kidney• Cannot be regenerated• Decrease by 10% every 10 years after the
age of 40 years
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RENAL BLOOD FLOW• 1200 ml/min• 21% of Cardiac Output• Weight: 0.4% of total body weight• Q= P/R Renal Blood Flow =(Renal Artery Pressure)-(renal vein Pressure) ÷
Total Renal Vascular Resistance
30 ©Prof. Dr. Rashid Mahmood30
OBJECTIVES• Goal /Aim
– By the end of this session students should be able to understand the Basic Concepts Functional characteristics of nephron
• Specific objectives• At the end of the lecture students should be able to
• Describe the Functions of the Kidneys • Outline Physiologic Anatomy of the Kidneys and Nephron• Describe The nephron as the functional unit of the kidney• Differentiate between Cortical and juxtamedullary
nephron
35 ©Prof. Dr. Rashid Mahmood 35
Total length of all
Nephrons in both
kidneys= 100 km
Diameter of nephron=
10-60 microns
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Q. 3
There are how many portal systems in the body. Name them; tell their location.
©Prof. Dr. Rashid Mahmood 36
37 ©Prof. Dr. Rashid Mahmood37
OBJECTIVES• Goal /Aim
– By the end of this session students should be able to understand the Basic Concepts Functional characteristics of nephron
• Specific objectives• At the end of the lecture students should be able to
• Describe the Functions of the Kidneys • Outline Physiologic Anatomy of the Kidneys and Nephron• Describe The nephron as the functional unit of the kidney• Differentiate between Cortical and juxtamedullary
nephron
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Summary • The urinary system is well known for eliminating wastes from the
body, but its role in homeostasis goes far beyond that.• Each kidney contains about 1.2 million functional units called
nephrons• A nephron consists of two principal parts: a renal corpuscle,
where the blood plasma is filtered and a long renal tubule that processes this filtrate into urine.
• Nephrons just beneath the renal capsule, close to the kidney surface, are called cortical nephrons
• Nephrons close to the medulla are called juxtamedullary nephrons
• Juxtamedullary nephrons are responsible for maintaining an osmolarity gradient in the medulla that helps the body conserve water.
• About 15% of the nephrons are juxtamedullary 42
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Learning Resources • Guyton and Hall (Text book of physiology), 13th Edition• Ganong (Text book of physiology), 24th Edition• Berne & Levy Principles of Physiology (Koeppen BM), 6th
Edition• Human Physiology Stuart Ira Fox, 13th Edition• Human Physiology : from cells to system Lauralee
Sherwood,9th Edition • Internet
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