|CIRCULATION OF THE BLOOD
One hundred thousand miles of blood vessels make up the elaborate transportation system that circulates materials for energy, growth and repair, and eliminates wastes for your body. These vessels called arteries, veins, and capillaries serve different functions. Arteries carry blood from the heart; veins carry blood to the heart and capillaries are exchange vessels or connecting links between the arteries and veins.
The pumping action of the heart keeps blood moving through the closed system of vessels. This closed system of circulation provides distribution of blood to the whole body (systemic circulation) and to specific organs, such as pulmonary circulation, or hepatic portal circulation. Blood pressure is the force of blood in the vessels. This force is highest in arteries and lowest in veins. Normal blood pressure varies among individuals and depends on the volume of blood in the arteries. The larger the volume of blood in the arteries, the more pressure is exerted on the walls of the arteries, and the higher the arterial pressure. Conversely, the less blood in the arteries, the lower the blood pressure.
A functional cardiovascular system is vital for survival because without circulation, tissues would lack a supply of oxygen and nutrients. Waste products would begin to accumulate and could become toxic. Your review of this system will provide you with an understanding of the complex transportation mechanism of the body necessary for survival.
Kinds of Blood Vessels
Structure of Blood Vessels
B. Capillaries minute/microscopic vessels.
Functions of Blood Vessels
Disorders of Blood Vessels
a. Aneurysms promote formation of thrombi that may obstruct vital blood supply to critical organs or tissues.
b. Aneurysms may burst, resulting in life-threatening hemorrhaging.
c. Cerebrovascular accident (CVA) or stroke-ischemia of brain tissue caused by embolism or hemorrhage.
Disorders of Veins (low pressure vessels)
Circulation of the Blood
Plan of Circulation refers to the blood flow through the vessels arranged to form a circuit or circular pattern.
Types of Circulation. Systemic circulation carries blood throughout the body. Path goes to and from the heart ventricle through the aorta, smaller arteries, arterioles, capillaries, venules, the venae cava, to the right atrium of the heart.
Blood Pressure. Blood pressure is clinically measured by an instrument called a sphygmomanometer. It is highest in arteries, lowest in veins. Blood pressure gradient causes blood to circulate liquids can flow only from the area where pressure is highest to where it is lower. Blood volume, heartbeat, and blood viscosity are main factors that produce blood pressure. Blood pressure varies within normal range from time to time. Pulse Definition the rhythmic expansion of an artery which can be felt with a finger. Normal pulse rate is 50-100 beats per minute.
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