Atrial volume receptors
Atrial Volume Receptors
Atrial volume receptors (pronunciation: /ˈeɪtriəl ˈvɒljuːm rɪˈsɛptərz/), also known as atrial stretch receptors or low-pressure receptors, are specialized sensory nerve endings located in the walls of the atria of the heart. They play a crucial role in the regulation of blood volume and blood pressure.
Etymology
The term "atrial volume receptors" is derived from the Latin word "atrium", which means "entrance hall", and the English words "volume" and "receptor". The term reflects the function of these receptors in sensing changes in the volume of blood in the atria.
Function
Atrial volume receptors are activated by an increase in the volume of blood in the atria, which causes the atrial walls to stretch. This sends a signal to the brain, specifically the medulla oblongata, which responds by initiating a series of physiological responses to decrease blood volume and pressure. These responses include the suppression of antidiuretic hormone (ADH) secretion, stimulation of atrial natriuretic peptide (ANP) secretion, and inhibition of the sympathetic nervous system.
Related Terms
- Atria: The two upper chambers of the heart where the atrial volume receptors are located.
- Blood volume: The total amount of blood circulating within the body.
- Blood pressure: The force exerted by circulating blood on the walls of blood vessels.
- Medulla oblongata: The part of the brain that receives signals from the atrial volume receptors.
- Antidiuretic hormone (ADH): A hormone whose secretion is suppressed when atrial volume receptors are activated.
- Atrial natriuretic peptide (ANP): A hormone that is stimulated when atrial volume receptors are activated.
- Sympathetic nervous system: A part of the nervous system that is inhibited when atrial volume receptors are activated.
External links
- Medical encyclopedia article on Atrial volume receptors
- Wikipedia's article - Atrial volume receptors
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