• CIRCULATORY SYSTEM
    AGRICULTURAL SCIENCE

    CIRCULATORY SYSTEM

    Circulatory system involves all the organs and tissues which are concerned with the movement of materials from one part of the body to another where they are either used or removed. These organs and tissues include the heart, the blood and the blood vessels.   Composition of Blood Blood is a fluid tissue. It is made up of two parts: The fluid plasma and the blood cells or corpuscles. Plasma: Plasma is the liquid portion of the blood. It is made up of water, blood protein like globulin, fibrinogen prothrombin, dissolved mineral salts and other organic substances like hormones, enzymes, digested food and waste products within the body. The blood…

  • RHESUS FACTOR
    BIOLOGY

    RHESUS FACTOR

    Rhesus factor in some red blood cells in some human beings was named after the rhesus monkey in which it was first discovered. Rhesus factor is an antigen present on the cell membrane of some red blood cells. The people that have it are rhesus positive (Rh ) and those that lack it are rhesus negative (Rh”) Rhesus factor (Rh): If a person with a Rh negative (a person without Rh antigen) is by mistake given a transfusion of Rh positive blood, his blood cells are stimulated by the presence of the Rh antigen to produce antibodies. The first transfusion does not cause any harm to the patient. But if…

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