What is the function of the presynaptic "autoreceptors" in axon terminals? O a. To release substances into the blood O b. To detect transmitter concentrations in the cleft O c. To release neurotransmitters into extracellular fluid d. To release the neurotransmitter acetylcholine

Ordinarily, a neuron’s trigger zone is activated before any other part ofan axon, so a wave of action potentials occurs as sodium channelsopen in the direction of the synaptic terminal. What would happen ifyou artificially stimulated an axon to reach threshold potential midwayalong its length rather than at the trigger zone?a. Action potentials would occur in the direction of the synapticterminal.b. No action potentials would occur.c. Action potentials would occur in the direction of the trigger zone.d. Both a and c are correct.

What is the name for a bundle of axons within a nerve?a. fascicleb. tractc. nerve rootd. epineurium

What is/are true statements about Action Potentials? Select all that apply. Group of answer choices: A. action potentials propagate down axons B. information is coded through the frequency of action potentials C. action potentials are slower in myelinated axons D. action potentials vary depending on the strength of the stimulus

A stimulus causes a change in permeability of neural membranes, which begins the process of transmitting an impulse. If the stimulus reaches the threshold potential of a neuron, an action potential is generated. Select the numbers of the statements below that occur once the threshold potential is reached. 1. Sodium ions flow into the neuron. 2. Sodium ions flow out of the neuron. 3. The membrane potential becomes positive. 4. The membrane potential becomes negative. 5. Voltage-gated potassium channels open. 6. Voltage-gated potassium channels close. 7. Potassium ions flow into the neuron. 8. Potassium ions flow out of the neuron. Place the numbers in order from the first event to the last event: and

Using cable theory to describe axon conduction would tell us a. the larger the diameter of the axon the faster the propagation of the action potential b. the larger the diameter of the axon the slower the propagation of the action potential c. the smaller the diameter of the axon the faster the propagation of the action potential d. that having big axons is of no benefit and only takes up a lot of space e. the nervous system mainly has small axons because they are much faster than large ones

33) What part of a neuron is responsible for receiving information?a. Axon.b. Node of Ranvier.c. Dendrite.d. Myelin sheath.

A neuron must reach threshold to fire an action potential. In this context, threshold refers to which event?     a. voltage at which damage occurs to the membrane because of the electrical charge     b. the voltage at which potassium ions begin to flow in and out of the cell     c. the voltage at which voltage-gated sodium channels open     d. the voltage at which the neuron can no longer produce an action potential   According to studies in developing rodents, testosterone treatment causes detectable changes in:     a. the sex region Y gene     b. the thalamus     c. the hypothalamus     d. alpha-fetoprotein

anatomy and psychology Choise What guarantees that there are unidirectional action potential? A. threshold B. depolarization refractory period  C. absolute refractory period D. relative refractory period

What is the correct statement about the myelin sheath?   a It is produced by ependymal cells.   b It allows rapid impulse transmission by saltatory conduction.   c It insulates the axon by surrounding it with protein.   d It surrounds the dendrites of a neuron.