File Name: chapter 10 blood composition and functions of blood .zip
Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. In vertebrates , it is composed of blood cells suspended in blood plasma. Albumin is the main protein in plasma, and it functions to regulate the colloidal osmotic pressure of blood.
Blood is a connective tissue that helps in the transportation of substances, protects against diseases and regulates the temperature of the body. Do you know why the colour of blood is red? It is red in colour due to a red pigment called haemoglobin present in its red cells. Plasma is a liquid also known as the fluid matrix and consists of three types of cells that keep floating in it namely red blood cells, white blood cells, and platelets. Blood has three main functions in the human body i. On average, a healthy man has about 5 litres of blood in the body, while a woman has about ml less than man.
Blood is composed of plasma and three types of cells: red blood cells, white blood cells, and platelets. Left tube: after standing, the RBCs have settled at the bottom of the tube. Blood is a circulating tissue composed of fluid, plasma, and cells. The cellular components of blood are erythrocytes red blood cells, or RBCs , leukocytes white blood cells, or WBCs , and thrombocytes platelets. Although it consists of cells suspended in fluid, blood is still considered a tissue as it is technically a type of extracellular matrix. Blood enables transport of cells and molecules between parts of the body.
See also Overview of Blood. Plasma is the liquid component of blood, in which the red blood cells, white blood cells, and platelets are suspended. It constitutes more than half of the blood's volume and consists mostly of water that contains dissolved salts electrolytes and proteins. The major protein in plasma is albumin. Albumin helps keep fluid from leaking out of blood vessels and into tissues, and albumin binds to and carries substances such as hormones and certain drugs.
These are classified as blood components prepared in the blood transfusion centre red cells, platelets, fresh frozen plasma and cryoprecipitate or plasma derivatives manufactured from pooled plasma donations in plasma fractionation centres such as albumin, coagulation factors and immunoglobulins. Plasma derivatives are covered by the Medicines Act and, like any other drug, must be prescribed by a licensed practitioner. Since , as a vCJD risk-reduction measure, all plasma derivatives used in the UK are manufactured using donations from countries with a low risk of vCJD. Whole blood is now rarely used for transfusion. Blood component therapy makes clinical sense as most patients require a specific element of blood, such as red cells or platelets, and the dose can then be optimised. Each component is stored under ideal conditions e. The use of blood components in clinical practice is covered in Chapters 7 to
Find GPs in Australia. The formed elements are so named because they are enclosed in a plasma membrane and have a definite structure and shape. All formed elements are cells except for the platelets, which are tiny fragments of bone marrow cells. Leukocytes are further classified into two subcategories called granulocytes which consist of neutrophils, eosinophils and basophils; and agranulocytes which consist of lymphocytes and monocytes. The formed elements can be separated from plasma by centrifuge, where a blood sample is spun for a few minutes in a tube to separate its components according to their densities. This volume is known as the haematocrit. WBCs and platelets form a narrow cream-coloured coat known as the buffy coat immediately above the RBCs.
You know what blood is — it's that red stuff that oozes out if you get a paper cut. But what is blood, really, and what does it do? Blood is needed to keep us alive. It brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body.
Chapter Blood. Blood Composition. Complete the following description of the components of blood by writing the missing words in the answer blanks. dowe.
Overview of Blood [link opens in new window]. Blood type refers to the presence or absence of specific molecules, called antigens, on the red blood cell RBC RBC surface. Antigens are molecules, such as proteins, lipids, carbohydrates or nucleic acids, that your body can use to differentiate self and non-self. People with different blood types have different antigens on their RBCs. Antibodies are produced in response to some antigens non-self , and are generally used by the immune system to recognize and facilitate removal of objects viruses, bacteria, tumorous cells, etc.
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Chapter Blood. Composition and Functions of Blood. 1. 1. Connective tissue. 2. Formed elements. 3. Plasma. 4. Clotting. 5. Erythrocytes. 6.