If a post synaptic neuron is stimulated to threshold by spatial summation this implies that the postsynaptic cells has many synapses with many presynaptic neurons the post synaptic cell has a lower than normal threshold the post synaptic cell has many voltage gated ion channels the post synaptic cell is slow to repolarize

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste. the percentage of food that the united states wastes each year is %.

The carrier molecules of the electron transport system are located in the