Decrease, enter, down, repolarize Increase, leave, against, hyperpolarize d chemical) gated Ca channels open in response to a e potential and Ca moves from (cytoplasm/ECF) to (cytoplasm, ECF). This 7) i, the a-on termnal, (mechanical, voltage, change in movement causes the release of neurotransmitter from synaptic vesicle Mechanical, cytoplasm, ECA b Voltage, cytoplasm, ECF c Chemical, ECF, Cytoplasm d Mechanical, ECF, Cytoplasm e Vortage, ECF, Cytoplasm 8 Which of the following defines a graded potential the best a Is a change in membrane potential with varying degrees of magnitude b. The stronger the triggering event the stronger the graded potential c it “dies of” as it moves down the soma towards the action hillock d. It can be modified by IPSPs and EPSPs e. All of them are true For the following 3 questions you will need to look at the following diagram Information given: An EPSP from neuron A causesa 10 mV change (from RMP); an IPSP from neuron B causes a 6 mV change and; an EPSP from neuron C causes 6 mV change. Use this information to answer the questions posed below. Figure 1. Neurons A, B, C and X, where X is the postsynaptic Questions: 9) What happens when ALL graded potentials reach the axon hillock (trigger zone) at the same time? a. The intensity is too strong and the neuron dies b. The stimulus is strong enough to reach threshold and create an action potential c. The graded potential of all 3 neurons cancel each other out creating no effect d. Graded potentials never reach the trigger zone no matter what e. None of these are true 10) An inhibitory postsynaptic potential (IPSP) would have what effect on the postsynaptic neuron? a. Depolarization b. Repolarization c. Hyperpolarization