Lecture outline 37
12/7/01 

Salt and Water balance

• osmoregulation - homeostasis
• excretory systems balance
• water
• ions
• nitrogenous wastes
• the basic processes
• making a primary urine
• secretion
• filtration
• reabsorption
• tubular secretion
• insect excretory systems
• vertebrate kidney
• filtration
• proximal tubular reabsorption
• making a concentrated urine
• blood pressure regulation
• negative feedback loops
• control of blood pressure
• circulatory 
• renal