5. What happens to the blood flow in the cardiac cycle?
A. Blood flows into the aorta through the semilunar valve due to contraction of the right ventricle.
B. Blood flows into the left atrium through the pulmonary artery when the walls of the left atrium
relax.
C. Blood flows into the right atrium through the vena cava when the walls of the right atrium relax.
D. Blood flows into the right ventricle through the semilunar valve when the walls of the right
atrium contract.

answer: 45

explanationyou have to add as well to be it could be

measuring physical properties lab reportinstructions: in the physical properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in tiny world. record your observations and test measurements in the lab report below. youwill submit your completed report.name and title: lyric lawton, mr.herbert, 10/13/17, physical properties lab. objective(s): i need to parvus build his house out of the right material, so he will stay cool in the mountains.hypothesis: if we use wood to build the roof of the house, then the temperature inside the house will remain cooler.if we use clay brick to build the walls and floors of the house, then the temperature inside the house will remain cooler.if we use aluminium to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.if we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.