Circulatory System

Topics: Blood, Heart, Red blood cell Pages: 5 (1597 words) Published: December 11, 2010
This paper will contain some important and main information about humans’ circulatory system. One of the most important systems our body has if not THE most important since one of its organs is the heart. We will focus on senior citizens. As we age, our organs’ working mechanism becomes slower and our muscles tend to be less flexible or elastic and that is why we think the information we will provide, will be very useful.

Some of the talking points will be:
General function of the system and how the organ system contributes to physiological homeostasis of the human organism •How the organ system (circulatory) does interacts with other organ systems in the human body. •Organs in this system and its functions.

Representative organ – its structure (including cells and tissues) and how the structure relates to the specific function of the organ. •One disease and how it affects the system and human health.

The Circulatory System

The circulatory system circulates blood throughout all the organs in the human body; and blood delivers oxygen and nutrients to every single cell and picks up waste and carbon dioxide from these cells it passes through. The heart (main system’s organ) pumps blood to the organs, cells and tissues of your body through arteries, arterioles, and capillaries and it is sent back to the heart through veins and venules (Texas Heart Institute, 2010). The human body has a closed circulatory system where blood is confined to the heart and blood vessels which branch elaborately throughout the tissues and organs of the body to allow exchange of nutrients and wastes. The circulatory system performs the following functions which contribute to the physiological equilibrium of the human organism and interaction with other systems such as digestive, lymphatic, respiratory (lungs), etc: •Transports oxygen from the lungs and gills to the tissues, and transports carbon dioxide from the tissues to the lungs or gills. •Distributes nutrients from the digestive system to all body cells. •Transports waste products and toxic substances to the liver, where many of them are detoxified, and to the kidneys for excretion. •Distributes hormones from the glands and organs that produce them to the tissues on which they act. •Helps to regulate body temperature by adjustments in blood flow. •Helps to heal wounds and prevent bleeding by creating blood clots (Audesirk, Audesirk, Byers, 2010). Blood is not the only fluid transported in this system. Lymph (which contains white cells) is another fluid in the circulatory system which is why we can say the cardiovascular and lymphatic systems make up the circulatory system and work closely with it. The circulatory system has three parts: the heart, the blood, and the blood vessels. The heart: which consist most of cardiac muscle. Each of these cells is small, divided and filled with an arranged selection of protein strands that give it a stripe appearance. As explained above, pumps oxygenated blood to the body and cells and deoxygenated blood to the lungs. It encloses two types of circulation/pumps, systemic and pulmonary and for each of these, there is one atrium and one ventricle leaving a total of four chambers. An Atrium collects the blood before passing it to a ventricle that propels it into the body. In one pump we find the right atrium and ventricle they deal with deoxygenated blood. The right atrium receives blood (oxygen-depleted blood) from the body through the two largest veins, superior and inferior vena cava. Then, once filled with blood, this atrium shrinks pushing blood into the right ventricle which also shrinks/contracts and then sends blood to the lungs through the pulmonary arteries (vessels that take blood away from the heart). The other pump formed of the left atrium and ventricle, deals with oxygenated blood from the lungs that enters the left atrium through pulmonary veins (vessels carrying blood to the heart as opposed to the arteries)...
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