Antidiuretic hormone (vasopressin) works at the level of the collecting duct to either increase absorption of water in order to maintain plasma volume and thus blood pressure. <span>This hormone is synthesized by special nerve cells of the hypothalamus and then transported to the pituitary gland where the hormone is released from vesicles into the bloodstream. Vasopressin is released in response to extracellular fluid hypertonicity. His functions are to reabsorb water back into the circulation, from the filtrate in the kidney tubules of the nephrons and to constricts arterioles (raises arterial blood pressure). </span>
Vestigial organs or parts of the body
are those that has lost its function in the course of evolution. These organs
or parts have degenerated or atrophied. It can appear as remaining small or
imperfectly developed. An example is the tiny eyes on an insect living in a
lightless cave.
Answer:
Because humans has not arrived until 20,000 years ago.
Explanation:
The genus homo has been taken to the emergence with the Homo habilis. Homo sapiens has been emerged around 300,000 to 200,000 years ago.
Holen and colleagues in 2017 discovered 130,000-year-old site in California that contain a a mastodon that had been butchered by humans. Some scientists express skepticism because it has been believed that only humans have occupied North America. The Homo sapiens has not arrived until 20,000 years ago.
