It is true that the epiglottis is a smooth muscle that covers the glottis during swallowing.
The epiglottis is a structure of elastic cartilage located just at superior portion of the larynx. The pelvis is an indentation in each lung thru which blood vessels enter and exit the lung. During swallowing, the epiglottis is indeed a smooth muscle that covers this same glottis.
The epiglottis is a cartilaginous flap of skin that controls the flow of air into to the trachea. The epiglottis is the topmost cartilage that protects the larynx while swallowing. The vocal cords have been pulled across the glottis as well as vibrated by exhaled air during speaking, producing sounds that can be converted into speech.
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