Page 122 - Biology Form Two

Biology for Secondary Schools

Capillaries in the lung

Pulmonary artery
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Pulmonary
circulation
Pulmonary vein

Left auricle

Left ventricle

Aorta

Vena cava Systemic
circulation Oxygenated blood

Deoxygenated blood

Capillaries in the body

Figure 5.14: Double circulation in human beings

The left auricle then pumps the blood aorta. The deoxygenated blood from
into the left ventricle. The left ventricle different parts of the body is brought
has strong muscles that pump blood to into the right auricle through the vena
all parts of the body through the aorta. cava.
After delivering the requrements to Formation of tissue fluid
the tissues, the blood flows back to Tissue fluid is a kind of fluid formed
the heart through the vena cava. This from blood plasma by a diffusion and
movement of blood between the heart filtration process. This fluid occupies
and various parts of the body is called much of the intercellular spaces in
the systemic cycle. Therefore, systemic the body and blood capillaries. They
circulation is the circulation of blood form a connecting link for transport
between the heart and all other parts of of nutrients, gases and other materials
the body, except the lungs. Oxygenated between blood capillaries, tissues, and
blood from the left ventricle is pumped lymphatic vessels.
to various parts of the body through the

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