These are muscular system, digestive system, integumentary system, skeletal system, circulatory system, respiratory system, lymphatic system, endocrine system, excretory system
.
The muscular system, in vertebrates, is controlled through the nervous system, although some muscles, like cardiac muscle & muscles in stomach walls, can be completely autonomous.
Digestive system breakdown the food and absorb nutrients from it.
Integumentary system act as a barrier, protect the inner stuff of body, regulate body temperature and also eliminate waste(e.g sweat).
Skeletal system supports the body and protect the internal organs(e.g rib cage protect heart and lungs).
Circulatory system help to transfer blood, nutrients, hormones, oxygen and other gases to and from different body parts.
Respiratory station of gaseous exchange i.e
O
2
in and
C
O
2
out of the body.
The respiratory tract is the path of air that starts from the nasal cavity and end in smaller alveoli in lungs. It's major role is in breathing, no doubt an inevitable process.
