section_path: Physiology
section_name: Physiology
paragraph_text: Physiology
  
  Many algae, particularly species of the Characeae, have served as model experimental organisms to understand the mechanisms of the water permeability of membranes, osmoregulation, turgor regulation, salt tolerance, cytoplasmic streaming, and the generation of action potentials.
  
  Phytohormones are found not only in higher plants, but in algae, too.