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*An in-depth explanation about the feline circulatory system
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It also has an in-depth description about the structure
of the arteries, veins and capillaries (Includes diagrams)
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A very thin sac known as the Pericardial Sac contains the heart which is located within the chest between the
rd
th
right and left lungs and extends roughly from the 3 to the 4 rib of the cat
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The heart is made of
primarily cardiac muscle which means the tissue continuously contracts and relaxes; for this to work a
constant supply of oxygen and nutrients are needed, these are supplied by the coronary arteries which are a
selection of blood vessels that deliver these needs directly to the heart
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Within the heart there are four chambers; the Right Atrium, the Right Ventricle, the
Left Atrium and the Left Ventricle which all do their separate unique jobs
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Blood is carried to the Right Atrium from distant parts of the
body through various veins
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The oxygen within the right atrium is considered very low
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To prevent blood from travelling backwards into the right ventricle during contraction there is
a pulmonary valve that sits at the opening of the pulmonary artery
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Carbon dioxide is then expired out
of the body and the intake of oxygen happens
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The left atrium sends all oxygenated blood to the left
ventricle; separating the left atrium from the left ventricle is a valve called the Mitral Valve
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The oxygen is dispersed throughout the
body by the aorta and other arteries
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The other function that the feline circulatory systems are in control of is getting rid
of carbon dioxide and waste products, maintenance of normal water and electrolyte balance and the
regulation of body temperature
The Structure of the Arteries, Veins and Capillaries
Arteries carry oxygen-rich blood from the heart to different parts of the body
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The wall of the artery has three layers; an outer layer called the Tunica Adventita,
a middle layer called the Tunica Media and an inner layer called the Tunica Intima
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Veins are similar to arteries by having three layers yet these layers are much thinner than those in arteries
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Veins are thin blood
vessels and are in charge of carrying blood from different parts of the body or organs towards the heart
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Small blood vessels that lead from the capillaries to larger veins are called
Venules
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Acting as a membrane, capillary walls allow substances such as oxygen, carbon dioxide, water, electrolytes,
nutrients and minerals to travel between blood and the tissues
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