Exhaust system affects fuel efficiency. If you notice you have to fill up your gas tank more often than normal, have your exhaust system checked out by a muffler repair shop. Similar to the vibrations, increased fuel use is a sign something is wrong with your car. When the exhaust leaks, your engine works harder.
Temporal summation is the linear addition of graded potentials that overlap in time; that is, a second potential arrives before the first one from that source has finished. Spatial summation occurs when there is simultaneous arrival of graded potentials originating from more than one synaptic input. Summation occurs at the trigger zone. Typically a multipolar neuron has many active synapses at a given time, with multiple potentials being produced at each.
In temporal summation, a single presynaptic neuron stimulates the creation of action potentials in a postsynaptic neuron when it. Fires at a fast enough rate that the sum of EPSPs in the postsynaptic neuron moves above threshold. î î î.uppose that the net summation of EPSPs and IPSPs is a depolarization that brings the membrane potential of the trigger zone of the postsynaptic neuron to -60 mV. Since -60 mV is below threshold, an action potential will not occur in the postsynaptic neuron.