Select all of the following that are true associations in the heart (multiple answers possible). -the atria and ventricles contract simultaneously
-the semilunar valves are secured via chordae tendineae
-the left ventricle pumps blood out to the systemic circuit
-the right ventricle receives deoxygenated blood from the atrium through the tricuspid valve
-the atria pump blood away from the heart, while the ventricles pump blood into the heart

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody