Multiple Choice
Blocking potassium ion channels in a mammalian cell membrane would __________.
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45. Nervous System
Neurons and Action Potentials
Back45. Nervous System
Neurons and Action Potentials
- Multiple ChoiceWhat is an increase in the magnitude of the membrane potential called?1706views
- Multiple ChoiceA drug that causes potassium to leak out of a neuron, increasing the positive charge on the outside, would __________.1475views
- Multiple ChoiceThreshold is of great significance in the physiology of neurons. What happens if threshold is not reached?1257views
- Multiple ChoiceWhich of the following is caused by the death of specific neurons in the brain that release dopamine?994views
- Multiple ChoiceTaking illegal amphetamines ("speed") can induce symptoms similar to which of the following?818views
- Multiple ChoiceWhich of the following neurotransmitters is most closely associated with schizophrenia, addiction, and Parkinson's disease?1178views
- Textbook Question
What happens when a resting neuron's membrane depolarizes?
a. There is a net diffusion of Na⁺ out of the cell
b. The equilibrium potential for K⁺ (Eₖ) becomes more positive
c. The neuron's membrane voltage becomes more positive
d. The cell's inside is more negative than the outside
2053views - Textbook QuestionTest your understanding of the nervous system by matching the following labels with their corresponding letters: CNS, effector cells, interneuron, motor neuron, PNS, sensory neuron, sensory receptor, spinal cord, synapse.1742views
- Textbook Question
Which ion most readily leaks across a neuron's membrane, helping to establish the resting potential?
815views - Textbook Question
A common feature of action potentials is that they
a. Cause the membrane to hyperpolarize and then depolarize
b. Can undergo temporal and spatial summation
c. Are triggered by a depolarization that reaches threshold
d. Move at the same speed along all axons
1370views - Textbook QuestionThe inside of the neuron has a lower concentration of positive ions than the outside of the neuron. Is the membrane potential positive or negative?1309views
- Textbook Question
Which of these statements about myelination in neurons is/are correct? Select True or False for each statement.
T/FIt speeds propagation by increasing the density of voltage-gated channels all along the axon.
T/FMultiple sclerosis is characterized by disrupted myelination of certain neurons in the central nervous system.
T/FIt speeds propagation by preventing cations from leaking out across the membrane as they spread down the axon.
T/FIt is more commonly observed in vertebrates than in invertebrates.
1032views - Textbook Question
Where are neurotransmitter receptors located?
a. The nuclear membrane
b. The nodes of Ranvier
c. The postsynaptic membrane
d. Synaptic vesicle membranes
1989views - Textbook Question
In a neuron, what creates the electrochemical gradient favoring the outflow of K+ when the cell is at rest?
a. Na+/K+-ATPase
b. Voltage-gated K+ channels
c. Voltage-gated Na+ channels
d. Ligand-gated Na+/K+ channels
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