Your body has a number of different systems: a circulatory system, a skeletal system, respiratory system, central nervous system, digestive system and others.
(Your body; has; a number of different systems: a circulatory system, a skeletal system, respiratory system, central nervous system, digestive system and others)
Your body
has
a number of different systems: a circulatory system, a skeletal system, respiratory system, central nervous system, digestive system and others