Bio 181 ASU Exam 3 Questions with complete solutions

Bio 181 ASU Exam 3 Questions with complete solutions List the 4 types of glial cells and list a phrase to describe their function. - answer1. 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. - answerTrue T/F The autonomic nervous system contains the sympathetic and the parasympathetic nervous system. - answerTrue T/F Voltage-gated ion channels open when a protein binds to the receptor. - answerFalse T/F The receptors in post-synaptic cells are the basis on which the synapse can be defined as inhibitory or excitatory. - answerFalse Briefly explain why the action potential flows only from the axon hillock to the terminal web. - answerThe 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. - answerFalse T/F Potassium ions are at high concentrations inside of cells including in neurons. - answerTrue 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. - answerCalcium ions. T/F Excitatory synapses make the post-synaptic cell less likely to fire. - answerFalse T/F Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to start the action potential in the postsynaptic cell. - answerTrue 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. - answerin 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. - answerThe answer is not on this list T/F The axon from a pre-synaptic cell contacts the axon of another neuron. - answerFalse T/F Fast neurons as described in lecture are fast because they are surrounded by a type of glial cell that results in a myelin coating. - answerFalse The neural tissues are: - spinal cord, sensory neurons, and cell body - spinal cord, sensory neurons, and brain - pituitary and hypothalamus - none of the above - answerspinal cord, sensory neurons and brain The central nervous system (CNS) contains: - nerves extending from the spinal column to the fingers - motor neurons extending from the spinal column to the fingers. - only the brain