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BIOL 161

Exam 2 Prep

QuestionAnswer
Sodium potassium pumps move ions down their concentration gradient - from high concentration to low concentration. true or false False
Which of the following characteristics contribute to sodium passively entering a neuron if the membrane is permeable to sodium (like through a channel)? the inside of the cell is more negative or more positive than the outside? More negative
Which of the following characteristics contribute to sodium passively entering a neuron if the membrane is permeable to sodium (like through a channel)? there are more or fewer sodium ions outside the cell compared to the inside of the cell? More sodium ions outside the cell than the inside
Pressure on the skin will physically force open ion channels in sensory neurons located in the skin. These channels would be considered: mechanically-gated channels
Which of the following ratios represent the movement of ions from OUT of a neuron to INSIDE a neuron due to the sodium potassium pump? 3 sodium ions out : 2 potassium ions in
Both the chemical concentration gradient AND the electrical gradient will attract potassium ions towards the inside of a cell. true or false false
Large negatively charge anions (generally proteins) are trapped inside of a neuron, making the interior of the cell slightly more negatively charged than the outside. true or false true
Neurons have significantly more leak channels for sodium in their membrane than they do for potassium. true or false false
A typical resting membrane potential for a neuron is: (resting potential) mV -70mV
Ions can cross a membrane without the help of an integral membrane protein. true or false false
In a neuron, the term "voltage" or "potential" refers to: The difference in electrical charge across the cell membrane
Created by: jmiles_24
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