Section 10.1

Question 1

protein horomone

Answer 1

a hormone composed of chains of amino acids that is water-soluble and usually acts on cell membrane receptors.

Question 2

steroid hormone

Answer 2

a hormone composed of cholesterol that is not very water-soluble. It usually passes through the cell membrane and acts on receptors inside the cell.

Question 3

glucagon

Answer 3

a hormone produced by the alpha cells in the pancreas that raises the blood glucose level by promoting the breakdown of glycogen in the liver

Question 4

Hormones are characterized by the following…

Answer 4

1. Produced by specialized gland
2. Secreted directly into the bloodstream
3. Effect on body must be elsewhere than where produced
4. Only very small amounts necessary
5. Act on specific target cells by regulating metabolic rate
   (controls activities of specific enzymes)
6. Hormones linked to specific target tissue by a specific receptor