Reference no: EM133929914

Question

1. A resting polarized neuron can be describe as having

a. a greater concentration of sodium inside the neurons than outside the neuron

b. a greater concentration of potassium ions outside the neuron than inside the neuron

c. an average difference of -70 mv between the inside and outside of the neuron

d. more negative charger outside the neuron due to high anion concentration outside

2. Once a neuron is depolarized there is a very short period of time when the neuron cannot be depolarized again called the

a. refractory period

b. lunch and break period

c. hyperpolarization phase

d. resting potential phase

3. What of these nerve fiber has action potential moving toward the central nervous system ?

sensory fiber

sympathetic nerve fiber

parasympathetic nerve fiber

motor fiber

4. The automimic nervous system controls involuntary muscle such as the cardiac & smooth muscle

true

False

5. It is important to remember to the neuroglia cells are not directly part of ;

A. forming insulating membrane to cover the axon

b. anchoring neuron to capillaries or nutrient supply

c. controlling the neuron environment

d. begin a pathways for the action potential

6. Electrical synapse between certain neurons of the brain are faster than chemical synapse because

a. chemical synapses directly the link cells rather than using chemical

b. gap junction allows for signs to pass directly from cells to cell

c. neurotransmitter are not found in the central nervous system to be effective neurotransmitter must

a. cause presynaptic ions such as Na+ K+ to diffusion into synapse

b. diffusion to low concentration before reaching the postsynaptic membrane

c. bind with neuroreceptor found on the postsynaptic membrane.