Cardiovascular

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[]  Click here to learn facts of how the blood gets throughout the body!!

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Cardiovascular System

-The heart is located in the **thorax** surrounded by the lungs. -During childhood the thymus, located in the upper chest, processes white blood cells. It also absorbs white blood cells that react with protein. During puberty this shrinks in a process called **involution.** -Brain takes 20% of our blood. –**Arteries** distribute blood to the body. As they branch off hey form capillaries. **Capillaries interexchange nutrients, oxygen, and other substances between blood and tissue cells.** -Veins transport **deoxygenated blood** to the heart. -The heart is a hollow muscular organ. It pumps blood through the body using arteries. It is the size of a small fist. It has spiral muscle fibers so it can contract on all sides. Each side has an atrium for incoming blood and a ventricle for outgoing blood. The **right ventricle** pumps oxygen poor blood to the lungs for **re-oxygenation**. It has four valves. The valves prevent blood from flowing in the wrong direction. Semi lunar valves regulate blood flow to the **aorta** and **pulmonary arteries**. The endocartium is the hearts inner lining. - The cardiac muscle has its own blood vesicles to supply it with oxygen and nutrients. These are called coronary vessels. -The **spleen** breaks down dead red blood cells.

=Reasons why cardiovascular system is the best: = -Transports important nutrients (blood, oxygen, carbon dioxide, and several amino acids) around the body -These nutrients have a variety of important roles, such as providing energy, maintaining homeostasis, fighting diseases -Everything needs blood to work -Without the heart no oxygen or wastes can be picked up by the blood, to reach both the brain and the excretory system. - The heart provides emotional support and physical by supplying oxygenated blood to the depleted organs. - It is the first system to be active in an embryo when it reaches its first 4 weeks after fertilization. The heart begins to pump. It is the most essential to the lives of humans, linking every organ together by use of the veins, arteries, capillaries, and blood vessels.

Heart Poem:

EACH HEART by: Kathryn O.

A heart beats for only so long No matter what you do, to keep it strong There are so many beats it will emit Before it gives out and finally quits

Take each day you are given with surprise Make each minute count, don't compromise Help someone out who is down on their luck Give what you can, if only a buck

With each beat of your heart, thank God up above For each beat of your heart is through him, sent with love Don't take for granted the life you are living Step up to the plate and with your heart, start giving

We do not know when our heart will give out Have faith in God, never have doubt In each heart he has given a mission Listen to yours and see his vision

Take what you find and turn it to action When you are done you'll feel such a reaction Your heart will beat a stronger rhythm And you will feel what you have been given

A love that is pure and unending A love in your heart that needs little tending Only you can hear what your heart is saying Heed your calling and never stop praying

[|http://freepoemsonline.blogspot.com]


 * Political Speech Transcript:**



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