Is the pharynx. It divides into the larynx (voice-box) which is in front and goes to the lungs and the esophagus which is in the back and goes to the stomach. The epiglottis in pharynx can cover up the larynx to direct food into the esophagus but never covers up the pharynx to direct air (hence swallowing air for intentional burping) and sometimes fails to protect the larynx (hence choking).
With a smaller mouth opening the air moves faster and 'wind chill' cools your hand.
The funnel
A vent allows for ventilation of air (allowing air in or out).
The opening of the cervix is closest to the vagina -- the one you can feel with your finger -- is called the external os (orifice). This os leads into the cavity of the cervix and then into the cavity of the body of the uterus. At the point where the endocervical canal meets the uterus is another opening, called the internal os. .
ostia is the inlet into the sponge and osculum is the outlet through which the entered water etc. moves out
The pharynx is the narrow opening at the back of the mouth. It is part of both the digestive system and the respiratory system.
No, they have a very narrow opening for a mouth, as they eat plankton.
A narrow opening can be considered a slit. Narrow openings can be very long or short. There are many different types of narrow openings.
Rip current
Rip current
Slot
spinal cord
The shape of the opening. A Beaker has a wide opening, the curved sides of the beaker do not converge. A flask has a narrow opening, the curved sides form a narrow neck, that can be bunged.
In protostome ("first mouth") the blastopore, or the first opening formed becomes the mouth. In deuterostomes ("second mouth"), the blastopore forms the anus and the mouth develops from a second opening.
Chanelled into a narrow opening.
crack!
The Mediterranean