What is the main function of platelets?Describe how the body stops bleeding.

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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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What is the main function of platelets?
Describe how the body stops bleeding.

Expert Solution

Step 1

Platelets are also called thrombocytes.They have no cell nucleus.They are fragments of cytoplasm.

Platelets are exclusively found in mammals and in other vertebrates thrombocytes circulate as intact mono nuclear cells.

Step 2

One major function of platelets is the contribution to the haemostasis.

Haemostasis can be defined as process of stopping bleeding at the site where there is interrupted endothelium.

Platelets contribute in haemostasis by following steps;

First , platelets attach the substances which are outside the interrupted endothelium.This process is called adhesion
Then they modify their shape ,turn on receptors,and cause the secretion of chemical messengers.This process is called activation
Then they connect to each other through receptor bridges (aggregations)

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