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Composition And Functions Of Blood Answer Key Pdf

composition and functions of blood answer key pdf

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When a sample of blood is spun in a centrifuge , the cells and cell fragments are separated from the liquid intercellular matrix.

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.

Composition of the 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. 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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Blood Basics

Blood is a combination of plasma and cells that circulate through the entire body. It is a specialized bodily fluid that supplies essential substances around the body, such as sugars, oxygen, and hormones. Hematologists work to identify and prevent blood and bone marrow diseases, as well as studying and treating the immune system, blood clotting, and the veins and arteries. In the United States U. This constitutes less than one percent of total deaths from disease. Plasma: This constitutes approximately 55 percent of blood fluid in humans.

Blood is a suspension of blood elements erythrocytes, leukocytes, and platelets in blood plasma. Blood elements can be separated from blood plasma using centrifugal force. Figure shows that the most descended are erythrocytes — the volume of erythrocytes in a sample of blood is called the hematocrit. Above the erythrocyte layer is found the white non-transparent layer composed of leukocytes and thrombocytes. In our blood vessels circulate about 4.

Blood , fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products. Technically, blood is a transport liquid pumped by the heart or an equivalent structure to all parts of the body, after which it is returned to the heart to repeat the process. Blood is both a tissue and a fluid. It is a tissue because it is a collection of similar specialized cells that serve particular functions. These cells are suspended in a liquid matrix plasma , which makes the blood a fluid. If blood flow ceases, death will occur within minutes because of the effects of an unfavourable environment on highly susceptible cells.

composition and functions of blood answer key pdf

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How does blood work, and what problems occur?

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Blood is made of of several components, including red blood cells, white blood cells, platelets, and the plasma, which contains coagulation factors and serum. Blood helps maintain homeostasis by stabilizing pH, temperature, osmotic pressure, and by eliminating excess heat. Blood supports growth by distributing nutrients and hormones, and by removing waste. These cells deliver oxygen to the cells and remove carbon dioxide. Blood plays a protective role by transporting clotting factors and platelets to prevent blood loss after injury. These cells—including neutrophils, monocytes, lymphocytes, eosinophils, and basophils—are involved in the immune response. In birds and non-avian reptiles, a nucleus is still maintained in red blood cells.

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  1. Daila R.

    10.04.2021 at 21:39

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