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Cardiovascular System Constitutes The Circulatory System and Performs The Following Functions

Hematology is the study of blood and the circulatory system. Blood performs vital functions in the body including transport, regulation, and protection. It transports gases, nutrients, hormones, waste products, and more through over 100,000 km of blood vessels to trillions of cells. Blood also regulates temperature, pH balance, and water content in cells. It protects the body from diseases and infection by carrying white blood cells and antibodies, and from blood loss through clotting. Blood is made up of plasma and formed elements including red blood cells, white blood cells, and platelets.

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Ahmad Wardiman
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36 views1 page

Cardiovascular System Constitutes The Circulatory System and Performs The Following Functions

Hematology is the study of blood and the circulatory system. Blood performs vital functions in the body including transport, regulation, and protection. It transports gases, nutrients, hormones, waste products, and more through over 100,000 km of blood vessels to trillions of cells. Blood also regulates temperature, pH balance, and water content in cells. It protects the body from diseases and infection by carrying white blood cells and antibodies, and from blood loss through clotting. Blood is made up of plasma and formed elements including red blood cells, white blood cells, and platelets.

Uploaded by

Ahmad Wardiman
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Hematology (Greek Haema = Blood; logy = Study

of). Hematology is the branch of medical science that


deals with the study of blood. Blood, along with the
cardiovascular system constitutes the Circulatory
system and performs the following functions:
1. Transport. Blood provides a pickup and delivery
system for the transport of gases, nutrients,
hormones, waste products, etc. over a route of
some 1,12,000 km of blood vessels, with 60–70
trillion customers (cells).
2. Regulation. It regulates the body temperature
by transporting heat from the tissues (mainly liver
and muscles) to the skin from where it can be lost.
Its buffers regulate pH of the body fluids, while its
osmotic pressure regulates water content of cells
through the actions of its dissolved proteins and
ions.
3. Protection. The blood protects the body against
diseases caused by harmful organisms by
transporting leukocytes and antibodies against
more than a million foreign invaders.
It also protects the body against loss of blood after
injury by the process of blood clotting.
Physical features. The blood is denser and more
viscous than water, slightly alkaline, sticky to touch,
and salty in taste. It clots on standing, leaving behind
serum. The normal total circulating blood volume
amounts to 8% of the body weight, i.e. 5–6 liters in
an average adult male weighing 70kg, and 4–5 liters
in a female. The interplay of various hormones that
control salt and water excretion in the urine keep the
blood volume remarkably constant.
Composition. Blood consists of 55% of watery liquid
plasma that contains various proteins and other solutes
dissolved in it. The rest 45% is the formed elements—
mainly the red blood cells (RBCs) but also white blood
cells (WBCs), and platelets (cell fragments). The RBCs
are the most numerous (4.5–5.5 million/mm3) and are
medium sized (7–8 µm). Next in number are platelets
(2.5–4.5 lacs/mm3) and are the smallest (2–4 µm) in
size. The WBCs number 4000–11000/mm3 and vary
in size from 8 to 20 µm. The percentage of whole
blood that is red cells is called hematocrit, its value
being 45

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