There are many theories which try to explain the mechanism of auto-regulation of blood flow. They are: 1. Myogenic theory 2. Tissue metabolite theory 3. Tissue fluid pressure theory 4. Renin-angiotensin theory, etc. (this theory is applicable only in kidneys) 1. Myogenic Theory (Fig. 3.53) According to This Theory: i. When there is an increase in pressure, initially there will [...]
In this article we will discuss about:- 1. Types of Shock 2. Signs and Symptoms of Shock 3. Stages 4. Events Occurs in Irreversible Stages 5. Treatment. Shock is defined as lack of tissue perfusion which occurs when there is an imbalance between the volume of blood present in the circulatory system and the capacity of the circulatory system itself. [...]
In this article we will discuss about:- 1. Regulation of Blood Flow 2. Coronary Blood Flow 3. Factors 4. Auto-Regulation. Regulation of Blood Flow: 1. Increased carbon dioxide tension (increased pCO2) is the most important factor. CO2 is a power full vasodilator of the cerebral blood vessels. Increasing the CO2 content of the inspired air (3-5%) almost doubles the blood [...]