The Excretory System Adapted from Perry Glickman

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Organs of the Human Excretory System 1. Lungs 2. Liver 3. Kidneys

Organs of the Human Excretory System 1.Lungs – excrete carbon dioxide. 2. Liver – produces urea and bile. 3. Kidneys – Filter blood (remove urea, adjust salt and water content of urine)

Lungs Pathway CO 2 from cells (Respiration) Carried by blood to alveoli/lungs Excreted through exhalation

Liver Pathway Excess amino acids Carried by blood to liver Liver forms urea Sends urea to kidneys

Kidneys

Big Picture! Blood travels by Aorta to the Renal Artery

Renal Artery takes blood into Kidney

Blood travels through arteries in Medulla

Blood enters capillaries in the Cortex

Blood by capillary enters Nephron (Filtered)

Blood returns by veins through Cortex and Medulla

Blood travels back to Vena Cava to heart

The Finer Details - Nephron 1. Glomerulus – Filtration of waste 2. Bowman’s Capsule – Collects Filtrate 3. Proximal Tubule – Reabsorption of water, glucose and other non-wastes 4. Loop of Henle – Reabsorption of water 5. Distal Tubule – Secretion of added wastes Filtrate enters collecting duct for final Excretion

Nephron Filtering Unit of Kidney 4 Functions – Filtration (Glomerulus/Bowman’s Capsule) – Reabsorption (Proximal Tubule/Loop of Henle) – Secretion (Distal Tubule) – Excretion (Collecting Duct)

Quiz - Questions 1.What organ filters out nitrogenous waste from the blood? 2.Where are the kidneys located? 3.What is the filtering unit of the kidney called? 4.Where are the four functions of the nephron?

Quiz 1.The kidney filters out nitrogenous waste from the blood. 2.The kidneys located in the the lower back. 3.The filtering unit of the kidney is called the nephron. 4.The filtrate is colleted in the Bowman’s capsule.

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