Question

what was the involuntary muscle and spinal cord

Answer 1

A muscle that contacts without conscious control and found in walls of internal organs such as stomach and blood vessels(including the heart)And,the cylindrical bundle of nerve fibres and associated tissue which is enclosed in the spine and connects nearly all parts of the body to the brain,with which it forms the central nervous system.

Answer 2

Involuntary muscles are the muscles which cannot be controlled by us .The muscles which are present in heart , respiratory system are some examples of involuntary muscles .
Spinal cord is the backbone ,which gives support to our body and works as a message transferrer from spinal nerves to brain.It is the part of nervous system.