URINARY SYSTEM

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URINARY SYSTEM or Excretory System

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Outcome: Urinary System By the end of the lesson you will be able to: Identify the main organs of the Urinary System. Explain the function of the main organs of the Urinary System. Discuss the importance of the Nephrons . Know how the Urinary System works.

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Urinary System Every day the kidneys filter nearly 200 liters of fluid from the blood-stream, allowing toxins metabolic wastes, and excess ions to leave the body in urine while returning needed substances to the blood.

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Organs and tissues involved with regulation of water content and salt concentration in the body and with the excretion of metabolic wastes and excess water and salt in the form of urine. What is the Urinary System ? Urinary System Blood (ions, pH, volume, osmolarity ) ammonia, urea, bilirubin , creatine drugs and toxins

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The function of the Urinary System What is the main function of the urinary System? Produce and eliminates urine from the body. Produce nonsolid wastes through sweat, urine and exhalation to help maintain homeostasis in the body).

The excretory system eliminates nonsolid wastes from the body.:

The excretory system eliminates nonsolid wastes from the body. skin lungs kidneys ureters urinary bladder urethra Nonsolid wastes are eliminated through lungs, skin, and kidneys. Lungs exhale carbon dioxide and water vapor. Sweat glands in skin release excess water and salts. Kidneys filter and clean the blood to produce urine.

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kidney ureter kidney ureter blader urethra Components of the Urinary System

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Components of the Excretory System What are the components of the urinary system? The skin and lungs are also included.

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cortex medulla Renal artery Renal vein Ureter (to bladder) Structure of the kidney A pair of bean-shaped organs. The size of your fist. Weighs: 125 grams to 170 grams. A human kidney weighs about 0.5% of total body weight.

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Frontal Section through the kidneys Cortex Medulla Renal column Pyramid Renal vein Renal pelvis Capsule Major calyx Minor calyx Papillae Ureter Renal artery

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Definition and Function of the kidney What is the function of the kidney? eliminate wastes by filtering and cleaning the blood to produce urine. composed of several layers and covered with a fibrous capsule, the renal capsule. The outer layer of the kidney is the cortex.

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The Kidney How does the kidney work? Ureter . Tube carrying excess water and Toxic Waste in the form of Urine produced in the kidney to the bladder. Renal Artery. Provides blood supply, brings waste and water to the kidney. Renal Vein. Drains blood without waste from the kidney. Collecting System. Urine produced by the parenchyma is transferred to tunnel-like area which acts like plumbing to move urine out of the kidney and into the ureter . Renal Parenchyma. Functioning part of kidney that filters blood and makes urine.

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Definition and Function of the Nephron The basic structural and functional (tiny) unit of the kidney where the filtering occurs. Clean the blood in a three-step process: Filtration Reabsorption Excretion. Reabsorbs what is needed Excretes the rest as urine Regulates the concentration of water and soluble substances like sodium salts by filtering the blood What is the Nephron ? What is its chief function?

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A normal kidney contains 800,000 to 1.5 million nephrons . Knowing the Nephron The nephrons are surrounded by capillaries

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Nephron structure Where is urine made? Nephrons What are the parts of a Nephron ? Bowman's capsule the glomerulus the proximal convoluted tubule the Loop of Henley the distal convoluted tubule the collecting duct

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Waste substances and excretion sites What is excretion? urinary system respiratory system integumentary system (or skin) Which ones are the body systems involved in excretion? process of removing wastes and excess products from the body.

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A NEPHRON ELIMINATES WASTES PRODUCTS

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Formation of Urine What is urine? Excess water, salts and nitrogen compounds. Produced in the kidneys as blood is filtered by the Nephrons Travels from the kidneys through the ureters to the bladder, where it is held until it is expelled through the urethra. Sterile liquid by- product of the body secreted (trickled) by the kidneys through a process called urination and excreted through the urethra.

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Definition and function of the Ureter a tube that carries urine from each kidney to the bladder. What is the function of the ureter ?

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The function of the Bladder and the Urethra

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Dialysis can be used to filter and clean the blood. The basic unit of a dialysis machine filters wastes from the blood. Dialysis Process A pump pushes blood through dialysis unit. Waste materials diffuse out of the blood, through membranes, and into the dialysis fluid Used dialysis fluid flows out. Clean dialysis fluid flows in . A trap prevents air bubbles from entering patient’s blood before it is returned to the body.

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Injury and disease can damage kidney functions. recipient and donor tissue must match The daughter and son in this photo donated a kidney and liver tissue to their mother. drugs prevent tissue rejection A kidney transplant can replaced damaged kidney.

Tips to keep in a good Kidney Function:

Tips to keep in a good Kidney Function

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Do not consume to much…

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HOMEWORK Research Information What might be one reason why so many nephrons are needed in the kidneys? What might be one reason that the rest of the nephron is so long compared with the glomerulus ? Explain why people without kidney function would need to have dialysis at least three times a week. You can find the information in your book on pages 924-929 Study pages 924-933 from your book. Some questions will come in the 1 st Bimonthly exam.

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thanks for YOUR ATTENTION.

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