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WARM UP
1. List 4 functions of skin.
2. Identify the structure or
structures responsible for each
function listed in #1.
WRAP UP
• Describe why
stratified squamous
epithelium is
effective as a part of
the integumentary
system (and its
functions).
Urinary System
Water and Solute Homeostasis
• Water and solute concentrations need to be
held steady in the body by keeping gains and
losses stable
– Gains
• Absorption through diet and body processes
– Losses
• Sweat, exhaling, urine
Water and Solute Homeostasis
• Best way to control water and solute loss is
through urine composition
– Doesn’t impact other processes and systems
Basic Structure
• Kidneys
– Blood vessels and tubules
– Filter fluid in blood
• Ureters
– Tube carrying urine to
bladder
• Bladder
– Urine storage
• Urethra
– Tube expelling urine
The Nephron
• Basic functional
unit of the kidney
– Millions in kidney
– Filter and control
water and solutes
– Associated with
blood vessels
The Nephron
• Structure
– Glomerulus
• Capillary clump +
Bowman’s capsule
• Water and solutes
filtered out of blood
– Proximal tubule
• Some water and
solutes returned to
blood
The Nephron
• Structure
– Loop of Henle
• Solutes pumped
back to blood
– Distal tubule
• Water returned to
blood
– Collecting duct
• Sends urine to
ureters
WRAP UP
• Describe how the urinary system attempts
to achieve homeostasis.
• Explain why the urinary system is the best
place to control water and solute levels.