The regulation of the heart is effected through the afferent (centripetal) and efferent (centrifugal) nerves of the heart (Fig. 7.79). The afferent nerves are: i. From the heart through the vagus nerve and from the aortic arch, the aortic nerve. ii. From the heart through the inferior cervical and first four thoracic ganglia and first four thoracic nerve roots into [...]
In this article we will discuss about the pressure and volume changes in the human heart and blood vessels with the help of suitable diagram. 1. Pressure Changes in the Human Heart and Blood Vessels: In Animals—Optical Method of Wiggers: A vertical glass tube filled with an anticoagulant solution is used as a cannula. One end of it is introduced [...]
The following points highlight the three types of circulations through special regions of heart. The types are: 1. Coronary Circulation 2. Hepatic Portal Circulation 3. Hypophysial Portal Circulation. Type # 1. Coronary Circulation: The flow of oxygenated blood from the ascending aorta to the heart muscle and the return of deoxygenated blood from the heart muscle to the right atrium [...]