Drugs to reduce the risk of rejection are given to organ transplant patients because the donated organs contain

answer; /// i do believe the correct answer is (

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

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.