Blood+hw-+kat

1) What are the functions of blood, and what are its two main portions?
The functions of the blood are transport, defense, and regulation. The main portions of blood are
 * The blood transports oxygen from the lungs and nutrients from the digestive tract to the tissues. It also picks up carbon dioxide and waste products from the tissues and takes them away to the lungs and kidneys.
 * The blood also defends the body against invasion by pathogens in several ways. For example, there are white blood cells that can attack pathogens.
 * The blood also has regulatory functions. For example, it helps the body temperature stay constant by picking up heat and transporting it throughout the body.
 * formed elements like cells
 * and plasma

(3) What substances allow red blood cells (RBCs) to transport oxygen?
Hemoglobin in RBCs allows RBCs to transport oxygen.

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(6) What are the different blood types and what determines blood type?
The different blood types are type A, type B, type AB, and type O. To determine someone's blood type it's based on the presence or absence of two possible antigens A and B on the surface of red blood cells

(7) Among the ABO types of blood, who can give blood to whom? Why?
Antibodies in the plasma cannot combine with antigens on the surface of the red blood cells or else agglutination occurs. With agglutination, anti- A antibodies combine with type A antigens, and anti- B antibodies combine with type B antigens. Type O blood is considered the universal donor because agglutination does not occur with any other blood type because Type O blood has neither A or B antigens so it will not react with Anti-A or Anti-B antibodies. Type AB blood is the universal acceptor because the body will have neither anti A or anti B antibodies.

(8) When does hemolytic disease in a newborn occur?
Hemolytic disease (WHEN BLOOD CELLS ARE ATTACKED AND DESTROYED) occurs in newborns when an Rh negative mother becomes pregnant with an Rh positive baby. The mother's blood will begin to make antibodies against the Rh positive red blood cells of the baby. The antibodies can cross over the placenta and cause hemolysis in the Rh positive child's red blood cells.

(9) Tell how the functions of the cardiovascular system contribute to homeostasis?
The functions of the cardiovascular system contribute to homeostasis by delivering oxygen and nutrients to cells and removing wastes.