Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
Explanation:
The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.
The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
The organism which is least similar to the other animals is the blue whale. This is because it belongs to the order cetacea while the other animals belong to the order carnivora. This means that the other animals are carnivorous in their mode of feeding but blue whale is not.
In the text, Frederick makes it clear to us the silver trump not only inspired the slaves, but him also. He couldn't see the trump without looking at it. He couldn't hear the trump without listening to it, and he couldn't feel the trump without feeling it either. [ i hope this helped :) ]
