Like other osmoregulatory animals that live in marine environments, sharks maintain tissue concentrations of sodium, potassium, and chloride that are hypoosmotic to the seawater. In contrast to the bony marine fishes, however, sharks do not need to drink seawater. Why?
| High urea and trimethylamine oxide concentrations keep shark tissues slightly hyperosmotic relative to seawater, so water is absorbed passively. |
| Sharks excrete large quantities of salt through their gills in exchange for water |
| Sodium, chloride, and potassium do not influence water balance in shark tissues. |
| Shark blood is hypotonic to the surrounding tissues, so water always moves passively into the tissue from the blood. |
High urea and trimethylamine oxide concentrations keep shark tissues slightly hyperosmotic relative to seawater, so water is absorbed passively.
Sharks do not drink seawater because the high concentrations of urea and trimethylamine oxide keep the sharks at slightly hyperosmotic levels compared to sea water. Therefore water is passively absorbed into them.
Like other osmoregulatory animals that live in marine environments, sharks maintain tissue concentrations of sodium, potassium,...
Can questions 1-10 all be answered please 1. In a beetle species, some individuals have large horns and others do not. Which of the following is required for longer horns to evolve via natural selection in this population? Individuals with longer horns must____________________. a. have a shorter generation time than short-horned individuals. b. All of these are required for longer horns to evolve through natural selection. c.have more offspring survive to breeding age than short-horned individuals. d. have received more...