Assigments Essay Example | Topics and Well Written Essays - 500 words

Assigments - Essay Example When the platelets come in close vicinity to the site of damage in the vessels, they start to change their shape and become swollen. At the same time, they contract to release essential substances which make them adhere to the damaged wall and in particular to the collagen in the walls of the damaged vessels. They also tend to release ADP. This substance further assists the platelets in their function and tend to stimulate the platelets which lie close to the damaged vessel by making them active. These platelets tend to cluster together and come and join the initial platelets that adhered to the vessel wall that was damaged. This results in the formation of a platelet plug which closes the damaged vessel. At the same time, there is further release of clotting factors. This mechanism indicates the positive feedback system of the human body where the activation of one platelet further stimulates the cascade and results in more stimulation and the formation of a platelet plug (Lauralee 2006 p322). Works Cited Top of Form Clark, Robert K.  Anatomy and Physiology: Understanding the Human Body. Sudbury, Mass: Jones and Bartlett Publishers, 2005. Print. Bottom of Form Top of Form Sherwood, Lauralee.  Fundamentals of Physiology: A Human Perspective. Belmont, Calif: Thomson Learning distributor, 2006. Print.