A&p Ii Final |129 Questions| With Correct Answers.

T or F, the mechanism of the "lethal hit" of cytotoxic T cells involves a protein called perforin. {Ans: True}Select the correct statement regarding blood cell formation. A. Yellow marrow is the main site of leukocyte formation B. Before the seventh month of fetal development, yellow marrow is the main site of blood cell formation C. Red marrow is the main site of blood cell formation throughout adult life D. The main sites of blood cell production in adults are the spleen and the liver {Ans: C. Red marrow is the main site of blood cell formation throughout adult life}Blood within the pulmonary veins returns to the ______. A. left atrium B. right atrium C. left ventricle D. right ventricle {Ans: A. left atrium}Which of the following is likely during vigorous exercise? A. capillaries of the active muscles will be engorged with blood B. blood flow to the kidneys increases C. the skin will be cold and clammy D. blood will be diverted to the digestive organs {Ans: A. capillaries of active muscles will be engorged with blood}Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by _______. A. diffusion B.