Podcast
Questions and Answers
Which one of these is a type of local potential?
Which one of these is a type of local potential?
- Endplate potential
- Synaptic potential (correct)
- Generator potential
- Action potential
What is the main characteristic of local potentials?
What is the main characteristic of local potentials?
- They initiate action potentials
- They are graded phenomena (correct)
- They result from opening/closing of ion-permeable channels
- They have longer duration than action potentials
Which one of these is an example of a local potential in neurons?
Which one of these is an example of a local potential in neurons?
- Synaptic potentials (correct)
- Endplate potentials
- Generator potentials
- All of the above
What happens if synaptic potentials depolarize the postsynaptic cell?
What happens if synaptic potentials depolarize the postsynaptic cell?
What is the ionic basis for EPSPs and IPSPs?
What is the ionic basis for EPSPs and IPSPs?
What is the typical value for ECl?
What is the typical value for ECl?
What is the main function of IPSPs in the postsynaptic cell?
What is the main function of IPSPs in the postsynaptic cell?
What is the main characteristic of temporal summation?
What is the main characteristic of temporal summation?
What is the main characteristic of spatial summation?
What is the main characteristic of spatial summation?
What are the three general types of local potentials?
What are the three general types of local potentials?
Which type of potential is depolarizing and results from the activation of sodium and potassium channels in the endplate of skeletal-muscle fibers?
Which type of potential is depolarizing and results from the activation of sodium and potassium channels in the endplate of skeletal-muscle fibers?
What is the region of membrane in skeletal-muscle fibers where a motor neuron innervates the muscle fiber at the neuromuscular junction (NMJ)?
What is the region of membrane in skeletal-muscle fibers where a motor neuron innervates the muscle fiber at the neuromuscular junction (NMJ)?
What triggers muscle contraction in a muscle fiber?
What triggers muscle contraction in a muscle fiber?
Where does inhibition of muscle contraction occur?
Where does inhibition of muscle contraction occur?
What term is used to describe the local potential that generates trains of action potentials (APs) in sensory receptors?
What term is used to describe the local potential that generates trains of action potentials (APs) in sensory receptors?
Which type of receptor is well studied and detects pressure (touch) stimuli in the palms, fingers, and other regions?
Which type of receptor is well studied and detects pressure (touch) stimuli in the palms, fingers, and other regions?
What type of ion channels does the Pacinian corpuscle have?
What type of ion channels does the Pacinian corpuscle have?
What is the term used to describe the amount of depolarization in a receptor potential that is proportional to the intensity of pressure?
What is the term used to describe the amount of depolarization in a receptor potential that is proportional to the intensity of pressure?
What encodes the stimulus intensity in a receptor potential?
What encodes the stimulus intensity in a receptor potential?
What is the term used to describe the concept that each action potential (AP) arriving in the central nervous system has the same amplitude, while the number of APs per second (frequency) encodes the stimulus intensity?
What is the term used to describe the concept that each action potential (AP) arriving in the central nervous system has the same amplitude, while the number of APs per second (frequency) encodes the stimulus intensity?
Which of the following is true about the soma?
Which of the following is true about the soma?
What is the role of the soma in neural integration?
What is the role of the soma in neural integration?
What is the main reason why the depolarization caused by individual potentials does not sum up algebraically?
What is the main reason why the depolarization caused by individual potentials does not sum up algebraically?
What is the result of repetitive stimulation of a single synapse?
What is the result of repetitive stimulation of a single synapse?
What can lead to an action potential at the axon hillock?
What can lead to an action potential at the axon hillock?
What can cancel the effects of excitatory postsynaptic potentials (EPSPs)?
What can cancel the effects of excitatory postsynaptic potentials (EPSPs)?
What can produce no change in membrane potential but still effectively counter an EPSP?
What can produce no change in membrane potential but still effectively counter an EPSP?
What is the significance of neural inhibition?
What is the significance of neural inhibition?
What is the effect of tetanus toxin on inhibitory synapses?
What is the effect of tetanus toxin on inhibitory synapses?
What is the main cause of death in tetanus infections?
What is the main cause of death in tetanus infections?