In eukaryotes, how can a single gene code for several different proteins?

enzyme speed up the reactions

there’s no image attached but i can if you want: )

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.