Essay about The Circulatory System

Essay about The Circulatory System

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The Circulatory System

The circulatory system can be greatly affected by the type and amount
of training a person does and therefore has to be considered very
closely compared to other body systems.

The main functions of the circulatory system are:

· Transport- carrying blood, water, oxygen and nutrients throughout
the body, and transport the removal of waste.

· Body temperature control-the blood absorbs the body heat then
carries it to the lungs and to the skin, where it is then released.

· Protection- it helps to fight disease, e.g. antibodies, which fight
infection, are carried in the blood and the clotting of seals cuts and
wounds.

The circulatory system has four main parts:

· The heart

· The blood vessels

· The blood

· The pulmonary and systemic circuits.



The heart
=========

1. The blood enters the right-hand atrium. The blood is deoxygenated.

2. The right atrium pumps this blood into the right ventricle.

3. The right ventricle pumps the blood through the pulmonary artery to
the lungs where oxygen is picked up.

4. The blood then returns to the left atrium through the pulmonary
vein.

5. The left atrium pumps the blood into the left ventricle. The blood
leaves here through the aorta to be distributed to the rest of the
body.

From here the blood looses its oxygen because it is used for other
bodily functions. The cycle then takes place all over again.



Blood vessels
=============

Arteries- These carry blood at high pressure away from the heart;
these are the thickest blood vessels. The artery has an inner lining
called the endothelium, then a layer of...


... middle of paper ...


...lucose
and amino acids, waste products such as urea and some carbon dioxide
and oxygen.

The pulmonary and systemic circuits

The pulmonary circuit carries deoxygenated blood through the heart to
the lungs where it exchanges carbon dioxide for oxygen to become
re-oxygenated. The pulmonary vein transports oxygenated blood to the
left atrium of the heart.

The systemic circuit carries oxygenated blood through the aorta from
the left ventricle of the heart to all over the body, through
capillaries. Having deposited most of the oxygen the blood flows back
through the veins, into the right atrium through the vena cava. In
this circuit the blood visits the cardiac muscle of the heart, the
stomach, the intestines and liver, the muscles and skin. Oxygen
transported through this system is vital for physical activity.

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