With hard numbers or estimates from all but three of the 49 states that have laws allowing for issuance of carry permits, the U.S. Government Accountability Office reports that there were about 8 million active permits in the United States as of December 31, 2011.
Mar 18, 2016. There are 11 major organ systems in our body. This includes the circulatory, respiratory, digestive, excretory, nervous, and endocrine systems. As well as the immune, skeletal, reproductive, muscle and integumentary systems.
Organ Systems â Working Together. There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ. Organ Systems are composed of two or moredifferentorgans that work together to provide a commonfunction. There are 10 major organ systems in the human body (only 7 listed below.