|
|
 |
I. Introduction
Below is a free term papers summary of the paper "I. Introduction." If you sign up, you can be reading the rest of this term papers in under two minutes. Registered users should login to view this term paper.
| Term Paper Title | I. Introduction |
| # of Words | 893 |
| # of Pages (250 words per page double spaced) | 3.57 |
I. Introduction
Blood is the river of life that flows through the body. We
cannot live without it. The heart pumps blood to all our
body cells, supplying them with oxygen and food. At the
same time blood carries carbon dioxide and other waste
products from the cells. Blood also fights infection and
keeps our temperature steady, and carries chemicaks that
regulate many body functions. Finally blood even has
substances that plug broken blood vessels to prevent us
from bleeding to death.
The amount of blood in your body depends on the size of
your body and the altitude of where you live. An adult who
weighs 160 pounds has about 5 quarts of blood. An 80
pound child has about half that. People who live in high
altitudes, where the air contains less oxygen , may have up
to two more quarts than people that in lower regions. The
extra blood delivers extra oxygen to the cells.
II. Compisition
Blood consists of cells that move about in watery liquid
called plasma. The cells are known as formed elements
because they have definite shapes. Three types of cells
make up the formed elements: (1) red blood cells, (2) white
blood cells, and (3) platelets. A microliter (1/30,000 of an
ounce) of blood normally contains 4 million to 6 million
red blood cells, 5,000 to 10,000 white blood cells, and
150,000 to 500,000 platelets. Plasma is the liquid straw-
colored part of blood. It makes up about 50 to 60 percent of
the total blood volume. The formed elements count for the
rest.
Plasma consists of about 90 percent of water. Hundreds of
other substances make up the balance. They include
proteins that enable blood to clot and fight infection;
dissolve nutrients; and waste products. Plasma also carries
chemicals called hormones, which control growth and
certain other body functions.
Red blood cells consists mainly of hemoglogin, an
oxygen- carrying protein that gives them their red color.
The cells alco consist of chemicals, mainly enzymes.
Enzymes enable the cells to carry out necessary chemical
processes more effectively.
White blood cellsalso called leukocytes, fight infections
and harmful substances that invade the body. Most of the
cells are round and colorless. They have several sizes, and
their nuclei vary in shape. Some kind of white blood cells
kill bacteria by surrounding and digesting them. Other
kinds produce antibodies, proteins that destroy bacteria,
viruses, and othe
This is not the end of the termpaper! Register below to see the complete version of this term paper.
| Membership Plans |
Credit Card |
Check |
 |
| 1 month membership |
|
3 month membership
(You Save 50%) |
|
6 month membership
(You Save 67%) |
|
|
