PhysioEx Exercise 3 quiz with 100% Correct Answers

PhysioEx Exercise 3 quiz with 100% Correct Answers What is the approximate concentration of K+ inside a typical cell? - Answer️️ -150mM What is the approximate concentration of Na+ inside a cell? - Answer️️ - 5mM What is the approximate concentration of Na+ outside a cell? - Answer️️ - 150mM What is the approximate concentration of K+ outside a typical cell? - Answer️️ -5mM A negative membrane potential was recorded when the tip of the microelectrode was - Answer️️ -both inside the cell body and inside the axon Which of the following caused a change in membrane potential from -70 to -40 in the cell body? - Answer️️ -an increase in extracellular K+ Which of the following has the most negative voltage? - Answer️️ - between the inside of the axon and the outside of the axon with control K+ ECF Assuming the resting potential of a sensory neuron is -70mV, which of the following represents a depolarization? - Answer️️ -change to -60mV ©SOPHIABENNETT@ Monday, August 26, 2024 6:09 AM Thompson Rivers University (TRU) 2 Which of the following is a sensory modality? - Answer️️ -all of the above (touch, smell, sight, & paint) which of the following is a sensory stimulus? - Answer️️ -all of the above ( pressure, chemical odorants & light) Which of the following is true of the response of a sensory neuron to the appropriate sensory stimulus? - Answer️️ -it can be a receptor potential & it is a graded potential AND it is a change in the resting membrane potential A very intense stimulus can sometimes stimulate sensory neurons that have evolved for a different modality. Thus, with a blow to the eye, one "sees stars". In this example, the photoreceptors in the eye are responding to - Answer️️ -intense pressure Olfactory receptor neurons respond to low concentrations of chemical odorants because there are membrane proteins in the receptor ending of this sensory neuron that - Answer️️ -can bind and respond to the specific odorant The sequence of events starting with a sensory stimulus and ending with a change in membrane potential is called - Answer️️ -sensory transduction ©SOPHIABENNETT@ Monday, August 26, 2024 6:09 AM Thompson Rivers University (TRU) 3 Starting at a resting membrane potential of -70mV a change to which of the following represents the largest receptor potential? - Answer️️ -a change to -50mV Axons are - Answer️️ -long, thin structure that extend from a neuronal cell body which of the following is easier? - Answer️️ -extracellular recordings of action potential An action potential is usually initiated in an axon at or near - Answer️️ - all of the above (the axon hillock, the initial segment, or the trigger zone) The initiation of an action potential in a sensory neuron in the body normally - Answer️️ -follows a sufficiently large depolarizing receptor potential The threshold voltage in an axon is usually - Answer️️ -less ne