Assertion: contraction | /r/HasProperty | visible
Facets:
value: externally
type: DEGREE
Source sentences:
text: This process is effected by two methods: the air is swallowed, and is then forced into the cavity of the body, its return being prevented by a muscular contraction which is externally visible: but the water enters in a gentle stream through the mouth, which is kept wide open and motionless; this latter action must, therefore, depend on suction.