Nervous System Quiz

The next questions refer to the labeled structures in the diagram of synapse below. Which letter indicates the synaptic cleft? -A -B -C -D

D

The autonomic nervous system is most directly involved in: -driving a car -reading a textbook -sensing painful stimuli -digesting food

-digesting food

Which of the following descriptions accuratley represent area 2 of the graph? - The threshold in which signals have reached critical intensity and allow the neuron to fire - The resting potential, in which the axon contains more negative ions -Hyperpolarization, in which positive ion have excited the axon -Repolarization, in which potassium ions exit the axon - Depolarization in which sodium ions enter the axon

- Depolarization in which sodium ions enter the axon

The primary effect of the myelin sheath is to - increase the velocity of conduction of the action potential along the axon - increase velosity of conduction of the action potential across the synapse -facilitate the incoming stimulus signals at sensory receptors -reduce the amount of unused neurotransmitters in the synaptic cleft - protect the terminal buttons of the neuron form destruction by ezymes

- increase the velocity of conduction of the action potential along the axon

Which of the following occurs when a neuron is stimulated to its threshold? - the movements of the sodium and the potassium ions across the membrane creates an action potential -the neuron hyperpolarizes - Neurotransmitters are released from the dendrites - The absolute refractory period of the neuron prevents it from responding - the neuron's equilibrium potential is reached

- the movements of the sodium and the potassium ions across the membrane creates an action potential

During neuronal firing the part of the neuron that acts as a insulator and conductor to speed the electrical impulses as it travels down the axon is... - the terminal button -myelin sheath -a dendrite -the soma - the synaptic cleft

-myelin sheath

The brain is NOT involved in initiating action in which of the following situations? - Julie laughs at a joke made by her friend - chris is daydreaming about going for a jog on a beautiful morning - heather has fallen asleep and is experiencing a vivid dream - Barney is driving and sees a motorist swerve into his lane -maureen reflexively pulls her hand away from the fire

maureen reflexively pulls her hand away from the fire

Which of the following correctly describes the firing of neurons? -A protoplasmic transfer if ions -A finely graded response -An all-or-none response -An osmotic process

-An all-or-none response

Juana accidentally touched a hot iron. She immediately drew back her hand. Which of the following is true about the withdrawal of her hand? -It was in initiated in the motor cortex -It was initiated in the spinal cord -It was voluntary behavior -It was due to instruction from the brain

-It was initiated in the spinal cord

Which of the following is the correct sequence of the neural chain of events set in motion by an environment stimulus? -Receptors, afferent neurons, interneurons, efferent neurons, effectors -receptors, efferent neurons, interneurons, afferent neurons, effectors -Interneurons, effectors, receptors, afferent neurons, efferent neurons -Effectors, interneurons, receptors, afferent neurons, efferent neurons -effectors, receptors, afferent neurons, efferent neurons, interneurons

-Receptors, afferent neurons, interneurons, efferent neurons, effectors

The sympathetic nervous system is responsible for helping: -David become aware of his thrist while running a marathon -Tamera transfer sensory information into the other parts of her brain -Riesha get ready to fight or flee when seeing a bear -Anthony calm down after watching a scary movie

-Riesha get ready to fight or flee when seeing a bear

Which of the following is true of a neuron in the resting state? -The inside of the cell membrane is negative compared to the outside -The outside of the cell membrane is negative compared to the inside -The concentration of sodium ions is equal inside and outside of the cell membrane -Both the sodium and the potassium channels are open -The neuron is not polarized

-The inside of the cell membrane is negative compared to the outside

Which of the following biological systems is most likely responsible for an increase in heart rate while expericining anxiety? -The central nervous system -The sympathetic nervous system -The parasympathetic nervous system -The endocrine system

-The sympathetic nervous system

Neurotransmitters are typically stored in which of the following parts of a neauron? -The nodes of Ranvier -The myelin sheath -The terminal buttons -The soma

-The terminal buttons

Activation of the parasympathetic nervous system results in which of the following? -an increase in pupil dialation -an increase in respirtory rate -a decrease in digestio -a decrease in salivation -a decrease in heart rate

-a decrease in heart rate

Information is relayed to the spinal cord or the brain by: -afferent neurons -schwann cells -T cells -efferent neurons

-afferent neurons

The area labeled X in the drawing above denotes which of the following structures? -dendrites -nodes of ranvier -axon terminals -mitochondria Glial cells

-axon terminals

The function of dendrites is to: -receive information from other neurons -secrete neurotransmitters to the postsynaptic neuron -provide energy for the synthesis of acetylcholine -connect the cell body with the terminal branches

-receive information from other neurons

The process by which neurotransmitters are reabsorbed into the neuron after it fires is called: -depolarization -lateral inhibition -long-term potentiation -reputake

-reputake

The division of the nervous system that most directly allows voluntary muscle movement is the -midbrain -forebrain -sympathetic -parasympathetic -somatic

-somatic

Which part of the nervous system is most immediately activated by sudden fear? -parasympathetic -sympathetic -neostriatum -somatic

-sympathetic

Ben was enjoying a walk in the woods on a beautiful Saturday afternoon. As he went around a curve, he noticed a bear walking toward him. Immediately his pupils dilated, he began to perspire, and his heart accelerated. These changes are most closely related to the function of the -angular gyrus -hippocampus -parasympathetic nervous system -sympathetic nervous system

-sympathetic nervous system

The Sequence of shifts in the electrical charge of a neuron is called: -neural integration -refraction -synaptic transmission -the action potential

-the action potential

The part of the neuron that is responsible for recieving signals from other neurons is called... - the axon -the dendrite -a neurotransmitter -the synaptic cleft -the soma

-the dendrite

The time shortly after a neuron fires is referred to as: -the latent stage -the refractory period -the reticular formation -depolarization

-the refractory period