3.3. Regulation of Osmolarity - Extra-Cellular Fluid Volume Flashcards
What does an increase in Extra-Cellular Fluid Volume result in?
A decrease in ADH (Vasopressin) concentration
What does a decrease in Extra-Cellular Fluid Volume result in?
An increase in ADH (Vasopressin) concentration
What is the relationship between the rate of ADH secretion, and the rate of discharge from the stretch receptors in the Systemic Circulation?
Inverse
What are the different pressure areas of circulation?
- Low pressure areas
2. High pressure areas
Where are the low pressure receptors located?
- Left and Right Atria of the Heart
2. Great Veins
Where are the high pressure receptors located?
- The Carotid Baroreceptors
2. The Aortic Arch Baroreceptor
What are stretch receptors also known as?
Baroreceptors
What are the low pressure receptors also known as? And why?
Volume receptors because they monitor the return of the blood to the heart, and the “fullness” of circulation
How do low pressure receptors work?
They exert a tonic inhibitory discharge of ADH secreting neurons via the Vagus Nerve
What do moderate decreases in ECF Volume affect?
They primarily affect the Atrial Receptors
What does a moderate decrease in ECF volume, affecting the Atrial Receptors cause?
A decrease in atrial receptor discharge, and therefore an increase in ADH release
What happens if the volume changes enough to affect mean arterial blood pressure?
The carotid and arotic arch baroreceptors will also contribute to ADH secretion
What is a common, every day, movement which will cause an increase in ADH release?
Going from lying down to standing up
