An U.S. unit is being used to measure the patient’s heartbeat using a 10 MHz signal – if the Doppler signal is 700 Hz (as a result of the motion of the RBCs) and we assume scanning in soft tissue and at a 60 degree angle, what is the velocity of the RBC’s at the Aorta?

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.