The International Union for the Conservation of Nature (IUCN) lists 9 species of spider monkey, which can be found in rain forests from southern Mexico through Brazil. The IUCN lists 3 spider-monkey species as Critically Endangered; 5 species of spider monkey are listed as Endangered, and 1 species is Vulnerable.
The foundations of the endocrine system are hormones and glands. A gland is a group of cells that produces and secretes hormones. Hormones are the body's chemical messengers. They send and relay messages between different systems. Many different hormones move through the bloodstream.
Grades 9 to 12 â¢ Human Body Series. Endocrine System. The endocrine system is responsible for many amazing bodily processes: growth, sexual development, the fight or flight response to danger, and the process by which cells make energy and synthesize insulin. How the endocrine system works is compli cated, but the activities in this Teacher's Guide will help your students understand how it gets the job done. Keywords endocrine, diabetes, gland, glands, thyroid, pituitary, hormone, hormones