BSC 2011 Lecture Notes - Lecture 25: Distal Convoluted Tubule, Proximal Tubule, Waste

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Keith Choe

Document Summary

Bsc2011 - integrated principles of biology 2 - lecture 25: salt water balance and. Freshwater is 0-50 mosm, fish are 300 mosm. Water will enter the fish because of its higher concentration of salt. The fish will bloat unless it gets rid of the excess water. Large amounts of water flows into the gills passively. They also actively take in salt through their gills because they pee out some salt along with the water. Saltwater is 1000 mosm, fish are 300 mosm. Sw fish get water back by drinking a lot. Large amount of water is lost passively from the body. Large concentrations of salt is actively secreted from their gills. Salmon can switch between the fw and sw system. Excretory systems excrete waste and control volume and composition of the extracellular fluid (ecf). Kidneys are a major site for controlling blood osmolarity for land animals. Regulate fluid volume in the body-controls the urine and blood volume.