Knowra Blood Blood Blood is a fluid connective tissue made of plasma, cells, and cell fragments. It transports substances, supports defense against infection, and helps maintain the body's internal conditions.
Blood plasma : The liquid portion of blood, containing water, dissolved proteins, salts, nutrients, hormones, and waste products. It carries dissolved substances and suspends blood cells and platelets.
Circulatory system : The body system that moves blood through the heart and vessels to exchange substances with tissues. It provides the routes and pumping force for blood's transport functions.
Blood type : A classification of blood based on inherited antigens on red blood cells and antibodies in plasma. Compatibility depends on which antigens and antibodies are present.
Lymph : A clear fluid formed from tissue fluid that circulates through lymphatic vessels and carries immune cells. Unlike blood, it travels in lymphatic vessels and normally lacks red blood cells.
Red blood cell : A blood cell that contains hemoglobin and transports oxygen from the lungs to body tissues. These cells give blood its color and carry most of its oxygen.
Hemostasis : The process that stops bleeding through vessel constriction, platelet activity, and blood coagulation. It limits blood loss when a vessel is damaged.
Blood transfusion : The transfer of donated blood or blood components into a person's circulation. Transfusions replace blood or specific components after loss or illness.
Interstitial fluid : The fluid occupying spaces between tissue cells, where it supports exchange with capillaries. It exchanges materials with blood but is outside the blood vessels.
White blood cell : A blood cell involved in immune defense against pathogens, abnormal cells, and other threats. These cells make blood part of the body's immune defenses.
Blood coagulation : A cascade of reactions that converts soluble fibrinogen into fibrin to stabilize a blood clot. It builds a fibrin mesh that reinforces the platelet plug.
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