The sinoatrial (SA) node is indicated by ________
A
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The iron of the heme unit of hemoglobin is transported in the blood by the protein ________ after the aged erythrocytes are phagocytized.
Fill in the blank(s) with the appropriate word(s).
Valves of the heart open and close due to
A) electrical signals. B) contraction of papillary muscles. C) pressure changes. D) timing sequences. E) None of the answers are correct.
Increased metabolic activity and weight loss are associated with
A. lack of iodine in the diet. B. hyperthyroidism. C. too little TSH. D. cretinism. E. hypothyroidism.
Metastasis is
A. the abnormal development of a tissue. B. an obvious loss of cellular or structural differentiation in the orientation of cells to each other. C. the movement or spread of malignant cells. D. a generalized increase in the size of a part of an organ. E. an increase in the normal number of cells within a tissue or organ.