What is the relationship between membrane potential and resting potential?
If the membrane potential becomes more positive than it is at the resting potential, the membrane is said to be depolarized. If the membrane potential becomes more negative than it is at the resting potential, the membrane is said to be hyperpolarized.
How did the action potential at R1 change as you increased?
How did the action potential at R1 (or at R2) change as you increased the stimulus voltage above the threshold voltage? The action potential didn’t change as the stimulus voltage increased. This is because once the threshold is met, the even is all or none, not graded. An action potential is an “all-or-nothing” event.
How did the threshold for the second action potential?
How did the threshold for the second action potential change as you further decreased the interval between the stimuli? The threshold for the second action potential will be higher, which indeed requires increased strength in the stimulus.
How did the action potential at R1 or R2 change as you increase the stimulus voltage above the threshold voltage?
What type of sensory neuron would likely respond to the green light?
What type of sensory neuron would likely respond to a green light? Photosensory neurons would respond to green light.
Which of the following is a sensory modality?
A sensory modality (also called a stimulus modality) is an aspect of a stimulus or what is perceived after a stimulus. The term sensory modality is often used interchangeably with sense. The basic sensory modalities include: light, sound, taste, temperature, pressure, and smell.
Why do Photosensory neurons respond to green light?
Photosensory neurons would respond to green light. The very weak stimulus does not depolarize the axon of the sensory neuron to threshold. The stimulus induces a graded receptor potential at R1.
How do you change the membrane potential?
- opening of a Na+ channel will cause the cell to depolarize as Na+ ions move into the cell (i.e., the membrane potential will move toward the Na+ equilibrium potential)
- closing of a Na+ channel will shift the membrane potential toward the K+ equilibrium potential, causing the cell to hyperpolarize.
How does adding potassium change the membrane potential and why?
increase the membrane potential (hyperpolarize the cell) because the reduction in exterior positive charge will change the potassium equilibrium potential, allowing more potassium to leak out of the cell and making the interior more negative.
Which side of the membrane is positive?
extracellular side
What happens to the membrane when you try pushing it all the way to the right?
What happens to the SimCell (visible in the Cell View Monitor) when you try pushing the membrane all the way to the right? It will move to the left because there is more pressure on the outside of the membrane than the inside pushing the membrane inward.
What is membrane potential which side of the membrane is positive quizlet?
What is membrane potential? Which side of the membrane is positive? Voltage across the membrane. Outside is positive.