To keep from losing gains in fitness, it is necessary to maintain intensity levels. True.
There are different factors that may encourage substance abuse. Those factors can include stress of studies, trying to fit in because usually everyone at college parties do such kind of things, trying to get over something such as heartbreaks and even some substances help to become more hyper active and help with college errands.
However, there are also some reasons that might help a college student to stay away from such things. Those factors can include health reasons, parents pressure, college rules and even self-restrain
Short answer:
Valve which permits blood to flow from the right atrium to the right ventricle is tricuspid valve
Long answer:
The right side of the heart has lower pressure compare to the left side. There is a valve that support the lower pressure so the blood can move easily from the right atrium to the left ventricle. The valve is called tricuspid valve. It's called "Tri" because there are 3 flaps/leaflets on the valve.
For your information, the left side of the heart only has 2-leaflet valve, which make smaller circular opening compare to the 3-leaflet valve on the right side. That's because the left side has higher pressure than the right side.
