Sinoatrial node Ca into the cell), and the activation of potassium channels, which allows the flow of K out of the cell, making the membrane potential more negative. Heart rate depends on the rate at which the sinoatrial node produces action potentials. At rest, heart rate is between 60 and 100 beats per minute. This is a result of the activity of two sets of nerves, one acting to slow down action potential production (these are parasympathetic nerves) and the other acting to speed up action potential production (sympathetic nerves). The sympathetic nerves begin in the thoracic region of the spinal cord
Exposed node problem or the data rates are different) the problem may occur that the sender will not hear the CTS or the ACK during the transmission of data of the second sender. Exposed node problem In wireless networks, the exposed node problem occurs when a node is prevented from sending packets to other nodes because of a neighboring transmitter. Consider an example of 4 nodes labeled R1, S1, S2, and R2, where the two receivers (R1, R2) are out of range of each other, yet the two transmitters (S1, S2) in the middle are in range of each other. Here, if a