The Circulatory System About the system Blood Heart Vessels.
-
Upload
kristina-carson -
Category
Documents
-
view
218 -
download
0
Transcript of The Circulatory System About the system Blood Heart Vessels.
The Circulatory System
About the system
Blood Heart Vessels
About the circulatory system
Heart Blood vessels – arteries and
veins Blood
Functions of the circulatory system Transportation of gases, nutrients, ions
and waste Transports oxygen, carbon dioxide Transports glucose, fats, amino acids Transports hormones Regulation of body temperature Defense against disease – clotting and
immunity
http://greenfield.fortunecity.com/rattler/46/blood.htm
A few nights working in a trauma center would tend to convince one that the body is just a huge bag of blood. In fact, an "average" 70 litre human body contains only about 5 litres of blood, or 7% by volume. In the normal state, blood has no business anywhere except in the confines of the heart and blood vessels and in the sinusoids of the marrow, liver, and spleen. Of the average 5 L of blood, only 2.25 L, or 45%, consists of cells. The rest is plasma, which itself consists of 90% water (by weight) and 10% solids (mostly proteins, the greatest proportion of which is albumin). Of the 2.25 L of cells, only 0.037 L (1.6%) are leukocytes. The entire circulating leukocyte population, if purified, would fit in a bartender's jigger. The total circulating platelet volume is even less -- about 0.0065 L -- or a little over one teaspoonful.
Use this information to complete the table in your worksheet
Composition of Blood
Plasma 55% Blood Cells 45%
http://www.medicine.mcgill.ca/physio/vlabonline/bloodlab/hemat.htm
Blood plasma – 55% 55% of the blood slightly alkaline fluid typical yellowish color 90 % water, 10% dry matter organic substances – glucose,
lipids, proteins dissolved minerals
Blood cells – 45%
http://www.bayinsider.com/shared/health/adam/ency/imagepage/9123.000571.html
Red Blood Cells 99%
White Blood Cells <1%
Platelets
Blood cells – 45%
Red Blood Cells = Erythrocytes
Most numerous blood cells
No nucleus Biconcave shape Rich in haemoglobin … a protein
which can bind oxygen Last 120 days then recycled
White blood cells = Leukocytes
Less than 1% of blood cells Vital for defense against disease Many different types
NeutrophilsBasophilsEosinophilsMonocytesLymphocytes
Cells in the blood
Erythrocytes
Lymphocytes
Monocyte
Plateletshttp://www.mybloodyourblood.org/sFRwhitecells.htm
How blood cells are made
Platelets
The main function of platelets is to stop the loss of blood from wounds. To this purpose, they aggregate and release factors which promote the blood coagulation. reduce the diameter of damaged vessels slow down blood flow in that area trap cells to form the clot.
Even if platelets appears roundish in shape, they are not real cells.
The Heart
http://www.jdaross.cwc.net/heart.htm
Size of a clenched fist
Approximately 300 g
5-35 litres per minute
70 beats/minute
Blood vessels
Heart
Arteries
Veins
Arterioles
Venules
The whole system
Sickle cell anaemia
http://k14education.uams.edu/SickleCell/about.html
References
http://www.neosoft.com/~uthman/blood_cells.html
http://www.funsci.com/fun3_en/blood/blood.htm#0
http://www.bayinsider.com/shared/health/adam/ency/imagepage/9123.000571.html