Will mark what is the relationship between genes and chromosomes? a. chromosomes contain one or more genes. b. genes contain one or more chromosomes. c. chromosomes use dna code to manufacture genes. d. genes use dna code to manufacture proteins for chromosomes.

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.