Deglutition consists of three phases: oral phase, pharyngeal phase and oesophagal phase. The oral phase is voluntary whereas the pharyngeal and oesophagal phases are involuntary
Voluntary Group
Involuntary Group
(i) Membership is based on choice.
(i) Membership is based on birth.
(ii) It may be temporary or permanent in nature.
(ii) It is mostly permanent in nature.
(iii) Individual has choice...
Correct Answer - b
Muscles of the ducts of glands are.not exclusively supplied with involuntary muscles. Smooth muscles are involuntary muscles and are found in the posterior part of oesophagus,...