Author Question: Tears, saliva, urine, mucous secretions, and sweat act as chemical barriers. (Read 90 times)



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

armygirl

  • Hero Member
  • *****
  • Posts: 556

tuate

  • Sr. Member
  • ****
  • Posts: 332

 

Did you know?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

For a complete list of videos, visit our video library