In this article we will discuss about the changes that take place in the fetal circulation of blood at birth: 1. Primary Changes in Pulmonary and Systemic Vascular Resistance 2. Closure of the Foramen Ovale 3. Closure of the Ductus Arteriosus 4. Closure of the Ductus Venosus. 1. Primary Changes in Pulmonary and Systemic Vascular Resistance: First, loss of the [...]
In this article we will discuss about:- 1. General Features of Cerebral Circulation 2. Regulation of Cerebral Blood Flow 3. Measurement. General Features of Cerebral Circulation: 1. Adult brain weighs 1400 gm (2% of body weight), 60% is composed of white matter, 40% is composed of grey matter. 2. Cerebral blood flow is 750 ml/min or 50-60 ml/ min/100 gm. [...]
In this article we will discuss about the features and measurement of coronary blood flow in humans. Features of Coronary Blood Flow: The following summarizes important features of coronary blood flow: i. Flow is tightly coupled to oxygen demand. This is necessary because the heart has very high basal oxygen consumption (8-10 ml O2/min/100 g) and the highest A-VO2 difference [...]