Hemophilia is an x-linked recessive disorder that is passed through generations and can be traced by using a pedigree. mc023-1.jpg in the pedigree that is shown, which represents irene's allele combination?

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.