PinkMonkey Online Study Guide-Biology
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Figure 18.3 Preparation of blood smear
Figure 18.4 Observation of blood cells
Functions of blood
The importance of blood is proved by its manifold
Prevention of desiccation: Blood supplies
an adequate quantity of water to cells and prevents the tissue
from dehydration. However dry the skin may be blood always keeps
the interior of the body supplied with water.
Distribution of food: Blood distributes
back digested and absorbed food from the alimentary canal to
all parts of the body.
Transportation of respiratory gases:
Blood carries oxygen from the lungs to the different tissues
in the body and carbon dioxide from the body tissues back to
Transmission of hormones: Blood conveys
hormones, the secretion of ductless glands, from the glands
to the tissues and organs whose metabolism and functions they
Removal of waste products: Blood washes
out waste materials like urea and uric acid from the cells and
carry them to the organs of excretion.
Equalization of temperature: Blood maintains
the body temperature within the body by carrying heat from active
tissues to extremities (skin, lungs) where it can be dissapated.
Defense against parasitic invasion:
With the help of white blood corpuscles, blood destroys germ
cells and protects our body from diseases.
Chemical deliberation: Blood brings
about many chemical transformations, the chief being the formation
of antibodies which often confines a further attack of a particular
Clotting and healing the wounds: Bloods
stops excessive wastage of nutrients from cuts and wounds by
forming a clot. The leucocytes often help in healing the wounds.
It is believed that a few of them are converted into connective
tissue elements of the repaired region.
Because components of blood change in response
to changes in the body (diseases, infection, malfunction), blood
chemistry is useful for clinical diagnosis.
Table of Contents
Closed Vascular System
Arterial Blood Pressure
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