What happens to a cell after it has been infected? A. it lyses (explodes) when the bacteriophages break out
B. it expands
C. It shrinks
D. It dies immediately

B. it expands

its a

Explanation:

Bacteriophages, just like other viruses, must infect a host cell in order to reproduce lots of new phages, causing the cell to lyse (burst) and die in the process

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.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.