Heart sound 1 (S1) is the normal systolic heart sound. It is the first heart sound and is the "lubb" sound in lubb-dupp. The S1 sound is made when the mitral and tricuspid valves close, preventing ...

For everything you need to know about T, click here. WHAT’S CONSIDERED NORMAL when it comes to testosterone levels is relative. Normal varies from person to person, and doctors say your actual ...

The state-dependent chemoreceptor str-44 confers responsiveness to the putative food odors butyl acetate and propyl acetate and promotes starved-like foraging behaviors when expressed at high levels ...