BIO 181 ASU Exam Questions And Correct Answers

BIO 181 ASU Exam Questions And Correct Answers List the 4 types of glial cells and list a phrase to describe their function. - Answer -1. Schwann cells wrap around the axon of a cell in the PNS, while providing electrical insulation. 2. Oligodendrocytes do the same thing as Schwann cells but they do it in the CNS. 3. Astrocytes protect the brain from toxic chemicals. 4. Microgilia protect the brain. T/F When the presynaptic cells contacts a muscle cell, the synapse area is called a motor end plate. - Answer -True T/F The autonomic nervous system contains the sympathetic and the parasympathetic nervous system. - Answer -True T/F Voltage-gated ion channels open when a protein binds to the receptor. - Answer -False T/F The receptors in post-synaptic cells are the basis on which the synapse can be defined as inhibitory or excitatory. - Answer -False Briefly explain why the action potential flows only from the axon hillock to the terminal web. - Answer -The action potential originates from the axon hillock which initiates the flow of the action potential because of the presence of higher density voltage-gated ion channels. T/F Fast neurons as described in lecture require cytoplasmic signal transduction to open an ion channel. - Answer -False T/F Potassium ions are at high concentrations inside of cells including in neurons. - Answer -True In the motor end plate, the event that is the immediate trigger for exocytosis is: - Potassium Ions - Chloride ions. - The action potential. - The cell body. - Answer -Calcium ions. T/F Excitatory synapses make the post-synaptic cell less likely to fire. - Answer -False T/F Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to start the action potential in the postsynaptic cell. - Answer -True The post-synaptic cell can be: - in glands, muscle cells, neurons. - are only neurons. - have only chemical synapses. - have only electrical synapses. - this list contains no correct answers. - Answer -in glands, muscle cells, neurons. The resting potential of neurons is: - 0 mV - same as the action potential. - always a positive value. - two of the above. - the answer is not on this list. - Answer -The answer is not on this list