Concept explainers
To discuss:
The reason why spontaneous clotting usually occurs in veins, the danger of travelling blood clots, and the reason for the clots lodging in the lungs.
Introduction:
Hemostasis is the process by which the body stops blood loss, and there are three major hemostatic mechanisms: spasm of blood vessels, formation of platelet plug, and clotting of blood. When an injury occurs, local blood vessels first constrict to reduce blood flow to the area; next, platelets adhere to the collagen fibers of the vessel wall exposed by the injury and release substances that further promote platelet aggregation and vasoconstriction such as serotonin, adenosine diphosphate, and thromboxane A2; and subsequently, the coagulation of blood occurs. These mechanisms together help to stop blood loss.
Blood coagulation itself consists of two pathways (the intrinsic and extrinsic mechanisms) that reach a common convergence point after following different steps. The common convergence point of the two pathways is reached when factor X is formed. This continues on to the end point, which is the formation of fibrin
Disorders in blood clotting include the absence of appropriate clotting (clotting deficiency) and unwanted clotting (thrombosis).
Want to see the full answer?
Check out a sample textbook solutionChapter 18 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- different types of anemia and their characteristic MCH, MCV, and MCHC relative valuesarrow_forwardWhy veins are called capacitance vesselsand how this relates to the structural difference between veins and arteriesarrow_forwardSinusoid capillaries are found in all of the following areas of the body except carrying blood through the: skeletal muscles bone marrow liver O spleenarrow_forward
- Which tissues does not contribute to the functioning of an arteryarrow_forwardRenin-angiotensin system; its role in regulation of the blood pressure.arrow_forwardBranches of the right and left subclavian arteries which supplies the posterior aspect of the brain. Group of answer choices right and left common carotid arteries right and left brachiocephalic arteries right and left innominate arteries right and left vertebral arteriesarrow_forward
- Understanding Health Insurance: A Guide to Billin...Health & NutritionISBN:9781337679480Author:GREENPublisher:Cengage