BIO 181 (Capco ASU) Exam 3 (Final Exam)2023 With Complete Solutions Graded A+

BIO 181 (Capco ASU) Exam 3 (Final Exam) 2023 With Complete Solutions Graded A+ T/F Excitatory synapses cause hyperpolarization of post -synaptic cells. - Answer False The resting potential of neurons is: - Answer -60 mv (The answer is not on this list.) T/F The autonomic nervous system contains the sympathetic and the parasympathetic nervous system. - Answer True In the motor end plate, the event that is the immediate trigger for exocytosis is: - Answer Calcium Ions Draw an action potential in the axon of a neuron and indicate which ions flow into the neuron and out o f the neuron as the action potential passes at the point where the electrodes are in the cell. Be sure to assign on the Y -axis the mV of each of these areas. This should be as described in my lectures. - Answer The action potential is: - Answer A result of the movement of ions. T/F The cell body refers to the part of the neurons that begin at the dendrites and extend to the axon terminal. - Answer False T/F When the presynaptic cell contacts a muscle cell, the synapse area is called a motor end plate. - Answer True The post -synaptic cell can be: - Answer In glands, muscle cells, neurons T/F Excitatory synapses cause depolarization of the post -synaptic cell. - Answer True T/F Only pre -synaptic neurons are coated with myelin. - Answer False T/F Fast ne urons as described in lecture are fast because they are surrounded by a type of glial cell that results in a myelin coating. - Answer False T/F The axon from a pre -synaptic cell contacts the axon of another neuron. - Answer False List the 4 types of glia l cells and list a phrase to describe their function. - Answer - Microglia: Are part of the cellular immune system to protect the brain since the humoral immune system usually cannot cross the BB barrier. - Astrocytes: Contribute to the blood brain barrier - Schwann Cells: myelinates axons of the neurons in the PNS - Oligodendrocytes: Myelinates axons of the neurons of the CNS The central nervous system (CNS) contains: - Answer Brain and Spinal Cord (There is no correct answer). BIO 181 (Capco ASU) Exam 3 (Final Exam) 2023 With Complete Solutions Graded A+ T/F Fast neurons as described in lecture require cytoplasmic signal transduction to open an ion channel. - Answer False T/F Acetylcholine esterase breaks acetylcholine into muscarinic acid - Answer False T/F The membrane potential (resting potential) is largely set by the N a-K- ATPase pump. - Answer True T/F The receptors in post -synaptic cells are the basis on which the synapse can be defined as inhibitory or excitatory. - Answer False T/F The axon hillock in the pre -synaptic neuron fires based on temporal and spatial summation of inputs. - Answer True T/F Voltage -gated ion channels open when a protein binds to the receptor. - Answer False The neural tissues are: - Answer Spinal cord, sensory neurons, and brain T/ F Receptors are made from membrane -bound polyribosomes . - Answer True Draw a neuron, and label all the parts as described in lecture. - Answer 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 Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to start the action potential in the postsynaptic cell . - Answer True How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - Answer The cell wraps extensions of a fatty insulating substance (myelin) around the axons of neurons which increase the speed because the action potential jumps from each node of ranvier rather than going down the entire length and firing each Na+K+ pump. The terminal web: - Answer Is a site of exocytosis T/F Potassium ions are at high concentrations inside of cells including in neurons. - Answer True T/F Excitatory synapses make the post -synaptic cell less likely to fire. - Answer False