Schwann cells are a type of glial cell found in the nervous system. In addition to the conduction of nerve impulses, the outermost layer called neurilemma aids in nerve development and regeneration. After examining the image below, can you explain why brain cells have a. Neurons in the central nervous system lack neurilemma of Schwann cells. b. Neurons in the central nervous system are surrounded by white matter. c. Axons of the peripheral nervous system lack neurilemma of Schwann cells. d. Neurons in the peripheral nervous system are surrounded by grey matter.

Neurons are highly specialized cells whose form matches their function. They are highly elongated cells that conduct [Select ] a. ["electrical", b. "chemical"] signals across large distances, and [ Select ] ["chemical", b. "electrical"] a. signals across tiny spaces between neurons called [ Select ] a. ["hillocks", b. "Summations", c. "synapses"] . Neurons use vast amounts of energy to maintain the [Select] a. ["polarization", b."resting membrane potential", c. "action potential through the actions of [ Select ] a. ["sodium-potassium pumps", b."voltage-gated sodium channels", c."voltage-gated potassium channels"] . In doing so both sodium and potassium are trafficked against their concentration gradients leading to high concentrations of sodium [Select ] a. ["inside" , b. "outside"] the cell, and high concentrations of potassium [ Select ]

Match the description with the statement that best describes the following regions                                                             synaptic knob                                                             axon hillock                                                             dendrites                                                             axon A. elongated projection that conducts electrical signals over long distances B. receives input from other neurons C. region of high denisty of voltage-gated channels, known as the trigger zone D. contains numerous vesicles containing neurotransmitter

You touch a hot stove and withdraw your hand before you perceive the pain. Identify the neural pathway involved in this response. a. stimulus --> motor neuron --> interneuron --> brain --> sensory neuron b. stimulas --> sensory neuron --> interneuron --> brain --> motor neuron c. effector --> sensory neuron  --> interneuron --> brain --> motor neuron --> stimulus d. effector  --> motor neuron --> interneuron --> sensory neuron --> stimulas e. stimulas --> sensory neuron --> interneuron --> motor neuron

A neuron may receive signals from thousands of synaptic terminals. What determines whether the receiving neuron will respond by transmitting a signal?     a. the concentration of transmitter inside the receiving neuron     b. the summation of excitatory and inhibitory signals received     c. the number of glial cells contact the receiving neuron

Let’s examine a neural pathway that involved three (3) neurons in sequence: one propagates an action potential from threshold stimulus of receptor to spinal cord; second propagates action potential superiorly to brain stem; and third propagates action potential from brain stem to part of cerebral cortex involved in perceiving the stimulus. Which of the following is correct classification of these neurons: a. all three are presynaptic b. first is presynaptic, other two are postsynaptic c. first and second are presynaptic, third is postsynaptic d. first and second are presynaptic, second and third are postsynaptic e. all three are postsynaptic