The battery of your electric toothbrush is running down and so you feel a low-frequency vibration in your oral cavity. Which receptors detect this stimulus?

End bulb

Explanation:

It should be known or understood that the end-bulb is considered to be one of the known small encapsulated bodies which are found or located at the end of sensory nerve fibers. This can be found in the skin, mucous membranes, muscles, and some other areas. It is also called or referred to as the Krause's bulb or corpuscle.

In this case, it the part that is capable of detecting the low frequency of the vibration of the toothbrush.

It can also detect some changes like warmth or cold, depending on the one that is occurring.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.