Chapter 10 blood composition and functions of blood pdf

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chapter 10 blood composition and functions of blood pdf

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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?

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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. The fluid or liquid part of blood is called plasma. Plasma also contains some traces of other substances like amino acids, organic acids, vitamins, pigments and enzymes.

It carries these dissolved substances from one part to another part in the body. RBC is also known as erythrocytes. They are disc-shaped cells concave in the middle and visible under a microscope.

RBC carries oxygen from the lungs to all the cells of the body. They have no nucleus and contain a pigment called haemoglobin which is made up of an iron-containing pigment known as haema and a protein called globin. RBCs are produced in the spleen and the bone marrow and live for about four months because they lack a nucleus. So, when we donate blood to save the life of a person, then the loss of blood from our body is recovered within a day because red blood cells are made very fast in the bone marrow.

The life of the RBC is about days. What is Bombay Blood Group and how it is discovered? WBC is also known as leukocytes. They fight with infection and protect us from diseases because they eat up the germs which cause diseases. They are round or irregular, semi-transparent cells containing a nucleus and visible under a microscope.

They are a little larger than RBC. WBC in the blood is much smaller in number than red blood cells. Blood Platelets are also known as thrombocytes. They are tiny, circular or oval colourless cells formed in the bone marrow. They lack a nucleus and help in the coagulation of blood clotting of blood in a cut or wound, due to which bleeding stops. All the blood cells are made in the bone marrow from the cells called stem cells.

Plasma contains soluble protein fibrinogen of the blood which produces the insoluble protein called fibrin essential for blood coagulation which is formed in the liver. In an injury blood platelets break down and release an enzyme which helps in the formation of fibrin from fibrinogen. This fibrin forms clot in the form of a mass of fibres which stops bleeding from blood vessels. After clotting, a straw-coloured fluid called serum is left. In , K. That is why O is donated to any of the groups and so is known as Universal donor.

It is a blood antigen discovered in by Landsteiner and A. S Weiner and played an important role during a blood transfusion. It was initially found in the rhesus monkey and later in man. People who do not have this antigen in their blood are called Rh-. Basically, this happens in the case of the second issue. Blood Transfusion. This technique was first developed by James Blundell in The injection of blood from one person donor into the circulatory system of another is called a blood transfusion.

It is done after the proper matching of blood groups and the Rh factor. What is Blood Pressure and how it is measured? Blood Pressure is the force exerted by the blood beating against artery walls.

The highest point in the pressure range is called systolic pressure upper reading and the lowest point is called diastolic pressure lower reading. It is measured by an instrument called a sphygmomanometer. The diastolic pressure is always lower than the systolic pressure. High blood pressure is known as hypertension and low blood pressure is known as hypotension. In this blood carries oxygen, digested food and other chemicals like hormones and enzymes to all parts of the body and take away waste products like carbon dioxide and urea.

Therefore, the human blood circulatory system consists of the heart which pumps and receives blood and the blood vessels through which blood flows in the body. In the circulatory system, blood flows through three types of blood vessels: Arteries, veins, and capillaries.

The blood vessels are present in all parts of the human body so, that blood reaches everywhere in the body. There is another system with the blood circulatory system for transport in human beings is the Lymphatic System. Lymph is the liquid that circulates and carries materials in the lymphatic system. Haemolymph: Body fluid of Arthropoda is a colourless made of plasma and haemocytes. It do not contain any respiratory pigment like a cockroach. Human Circulatory System. To meet our Jury, click here.

It contains plasma, red blood cells, white blood cells, and platelets. It performs various functions in the body. Let us study in detail about the composition and function of blood, its components, blood transfusion, blood pressure, and blood group. Composition and Functions of Blood. Related Categories Biology. This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations.

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What's Blood?

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.

Chapter Blood. Blood Composition. Complete the following description of the components of blood by writing the missing words in the answer blanks. dowe.

Blood function and composition

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. The blood cells are mainly red blood cells also called RBCs or erythrocytes , white blood cells also called WBCs or leukocytes and platelets also called thrombocytes. The most abundant cells in vertebrate blood are red blood cells.

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.

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.

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.

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Глаза Сьюзан расширились. - Как прикажете это понимать. На лице Стратмора тут же появилось виноватое выражение. Он улыбнулся, стараясь ее успокоить. - С Дэвидом все в порядке. Просто мне приходится быть крайне осторожным. В тридцати футах от них, скрытый за стеклом односторонней видимости Грег Хейл стоял у терминала Сьюзан.


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