What are three ways that any pathogen could interfere with some aspect of the transfer of oxygen from the air to the blood such that a patient’s blood oxygen level could be dramatically below normal levels?

b. You have a neural system with three neurons; two presynaptic (PS1 and PS2) and one postsynaptic (Post). Over a fixed period of time, both PS1 and PS2 generate the pattern of action potentials shown in the figure below. Both deliver the same pattern. PS1 delivers EPSP to Post and PS2 delivers IPSP to Post. Also present in the system is a chemical that inhibits the binding of PS2’s neurotransmitter to Post’s receptors. Will Post be likely to produce an action potential in response to this situation? Explain your reasoning.

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