What determines whether a person has type A, B, or O blood?
A. Antibodies in blood plasma that react against foreign red blood cells
B. Antibody receptors on the surface of red blood cells
C. Glycolipids that act as antigens on the surface of red blood cells
D. Variant structures of hemoglobin within red blood cells
E. The presence or absence of spectrin in plasma membranes of red blood cells
C. Glycolipids that act as antigens on the surface of red blood cells
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Antigens of the surface of red blood cells are also called ________ and antibodies in the blood plasma are also called ________
A) agglutinins; agglutinogens B) agglutinogens; agglutinins C) T-cells; B-cells D) erythrogens; antibiotics E) serum; plasma
The inferior point of the heart is called the
A) apex. B) hilum. C) base. D) septum. E) mediastinum.
These cells populate the germinal centers of lymphoid follicles.
A. T lymphocyes B. B lymphocytes C. Reticular cells D. Macrophages
The ________ is the basic structural unit of compact bone
A) canaliculus B) osteon C) bone lamella D) central canal