Cognitive functioning affects how people think and their ability to remember things. Impairment in this area of brain health may cause a decline in how someone responds to their environment mentally ...

Jane Meacham has 40 years' experience researching, writing, and editing financial content. She previously worked at Dow Jones & Co. in the U.S. and Asia, and is certified in Global Reporting ...

Carol M. Kopp edits features on a wide range of subjects for Investopedia, including investing, personal finance, retirement planning, taxes, business management, and career development. Somer G.

The endocrine system is a network of glands and organs that uses chemical messengers called hormones to regulate metabolism, growth, reproduction, heart rate, blood pressure, and sleep-wake cycles.