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.