 |
| Diseases and Disorders of the Circulatory System |
|
|
| The condition in which a number of RBCs per cubic mm being less than normal is called anaemia. It may be due to poor diet or due to excessive bleeding. |
| |
|
| It is a congenital disorder where the red blood cells are sicke-celled. This reduces their oxygen-carrying capacity. It is fatal disorder. |
| |
|
| It is the hardening of arteries. High levels of blood cholesterol leads to deposition of cholesterol on the walls of the blood vessels. This makes the arterial walls lose their elasticity and result in their hardening. |
| |
|
| The arterial blood pressure becomes very high because the stiff walls cannot regulate the pressure changes. This is called hypertension or high blood pressure. |
| |
|
| It is the low arterial blood pressure. It may be due to anaemia or malfunctioning of the heart pump. |
| |
|
| It is the clot formation in the blood vessels which block the heart. Deposition of cholesterol also leads to thrombosis. The narrowing of blood vessels disrupts the secretion of prostacyclin. Prostacyclin prevents the sticking together of platelets. In the absence of this, the coagulated platelets get deposited in the walls and form the clot or the thrombus. This blocks the blood vessel. |
| |
