Final answer:
Lips and cheeks = Muscles, mostly orbicularis oris.
Hard palate = Bony structure.
Soft palate = Muscular structure.
Step-by-step explanation:
The lips and cheeks are important structures found in the mouth, also known as the oral cavity. The lips cover the orbicularis oris muscle, which regulates what goes in and out of the mouth. The cheeks make up the sidewalls of the oral cavity and are made up of connective tissue and buccinator muscles.
The hard palate is the anterior region of the palate and serves as a wall between the oral and nasal cavities. It consists of the maxillary and palatine bones and provides a rigid shelf for the tongue to push against while swallowing. The soft palate, on the other hand, is composed of skeletal muscle and is located at the posterior part of the palate.
It can be manipulated subconsciously for functions like yawning, swallowing, or singing.