Download Kidney PPT

Kidney Filtration Lab
Objectives
 Determine how kidneys function
 Identify components of the blood that should be
removed by the kidneys
 Identify components of blood that should not be
present in the urine
What Do Kidneys Do?
 Maintain HOMEOSTASIS
 Remove UREA and other waste
 Regulate the amount of WATER in the blood
 Adjust the CONCENTRATION of other substances in
the blood
 Send FILTERED blood back throughout the body
Blood Components
 The following items are found in the bloodstream:
 Water
 Red Blood Cells
 White Blood Cells
 Glucose
 Protein
 Amino Acids
 Salt
 Urea
Blood Components
 As blood goes through the kidneys, some
components of blood are



Kept: because they are ESSENTIAL for life functions
Removed: and EXCRETED in the urine because they are
TOXIC
Balanced: so they are present in the correct AMOUNT in the
blood
COMPLETELY reabsorbed (KEEP them all)
 SELECTIVELY reabsorbed (KEEP a certain amount as needed)

Blood Components
Blood Component
Water
Action Taken By Kidneys
Balanced
(Selectively Reabsorbed)
Red Blood Cells
Kept
White Blood Cells
Kept
Glucose
Balanced
(Completely Reabsorbed)
Protein
Kept
Amino Acids
Balanced
(Completely Reabsorbed)
Salt
Balanced
(Selectively Reabsorbed
Urea
Removed
Kidney Diagram
How Kidneys Work
 Blood enters the kidneys through the RENAL
ARTERY
 Blood branches out to small capillaries (called
GLOMERULUS)
 Big particles stay in the blood



Red Blood Cells
White Blood Cells
Proteins
 Small particles go into a holding area (called the
NEPHRON)
How Kidneys Work
 The material in the nephron is called FILTRATE
 The body REABSORBS some (selectively) or all
(completely) of the materials required for
homeostasis
 The remaining filtrate is sent to the bladder as
URINE