Which receptors are responsible for detecting internal pressure in blood vessels?

The correct choice is related to the specialized receptors that play a crucial role in detecting changes in blood vessel pressure. Baroreceptors are the primary receptors responsible for monitoring blood pressure levels within the circulatory system. They are located in key areas such as the carotid sinuses and the aortic arch.

These baroreceptors respond to the stretching of the arterial walls caused by blood pressure fluctuations. When blood pressure increases, the walls of the blood vessels stretch more, which stimulates the baroreceptors to send signals to the central nervous system. This information helps regulate blood pressure through various mechanisms, including adjustments in heart rate and vascular resistance.

While stretch receptors can respond to mechanical changes, they are generally more associated with the detection of stretching in various tissues rather than specifically focusing on blood vessel pressure. Chemoreceptors are specialized for detecting chemical changes, such as oxygen and carbon dioxide levels, in the blood, while photoreceptors are involved in the detection of light and visual stimuli. Understanding the specific functions and locations of these receptors helps clarify the role of baroreceptors in blood pressure regulation and the overall cardiovascular system.