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Jessica McKay
Physiology (Wks: 7-14)
| Question | Answer |
|---|---|
| The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? | 300 times faster |
| Dopamine, epinephrine, and norepinephrine are classified as: | Catecholamines |
| Severe depression can be caused by a deficit in certain brain synapses of: | Amines |
| Neurotransmitters are released in a synapse and bind to: | Receptors on the postsynaptic neuron |
| No impulse can be sent through a neuron: | During the absolute refractory period. |
| Compared with the outside of the neuron, the inside has a(n) ____ charge. | Negative |
| A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. | Local |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| Which is true of a neuron with a resting potential | The sodium pump has moved Na+ to the outside of the plasma membrane. |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| Excitatory neurotransmitters are most likely to: | initiate an action potential. |
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
| Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? | Phenelzine |
| Serotonin is an example of a(n): | Amine Transmitter |
| When an impulse reaches a synapse: | Chemical transmitters are released |
| Which is true of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged. |
| The first event to occur when an adequate stimulus is applied to a neuron is: | some of the sodium channels at the point of stimulation open. |
| Which of the following is not used by the body as a neurotransmitter? | All of the above are used by the body as neurotransmitters. |
| For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open? | Potassium and/or chloride channels |
| Which of the following is true of spatial summation? | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron. |
| Which neuron could transmit a nerve impulse the fastest? | A large-diameter neuron with myelin |
| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): | potassium. |
| The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is(are): | enkephalins. |
| A synaptic knob would be located on a(n): | Axon |
| When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: | saltatory conduction. |
| Stimulus-gated channels open in response to: | Sensory Stimuli |
| Which of the following statements about amino acid neurotransmitters is incorrect? | They are all inhibitory neurotransmitters. |
| A synapse consists of: | Synaptic knob synaptic cleft the plasma membrane of a postsynaptic neuron. |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | 130 meters per second |
| Once inside the sympathetic chain ganglion, the preganglionic fiber may: | synapse with a sympathetic postganglionic neuron. send ascending and/or descending branches through the sympathetic trunk to synapse with postganglionic neurons in other chain ganglia. pass through one or more ganglia without synapsing. |
| Which of the following statements is not true? | The major function of the parasympathetic division is to serve as an “emergency” system. |
| The preganglionic neurons of both the sympathetic and the parasympathetic divisions are cholinergic | TRUE |
| Tic douloureux is a painful neuralgia of the _____ nerve. | trigeminal |
| Which of the following is not true? | One bundle of nerve fibers (nerve roots) projects from each side of the spinal cord. |
| If the dorsal root ganglia of the spinal nerve were destroyed, a person would lose _____ related to that pathway. | sensory perception |
| Impulses from the _____ play a part in arousing or alerting the cerebrum. | thalamus |
| A child was frightened by a large dog. The pupils of the child’s eyes became dilated, and the heart and respiratory rates increased. These symptoms were caused by stimulation of: | the sympathetic nervous system. |
| Impulses sent over which of the following tracts could result in voluntary movement, especially of the hands, fingers, feet, and toes of the opposite side? | Lateral corticospinal |
| The cerebellum acts with the _____ to produce skilled movement. | Cerebrum |
| How does a dually innervated autonomic effector differ from a singly innervated autonomic effector? | A dually innervated effector receives input from both sympathetic and parasympathetic pathways. A singly innervated autonomic effector receives input from only the sympathetic division. |
| The vomiting reflex is mediated by the: | Medulla |
| The knee jerk can be classified as a segmental reflex because: | impulses that mediate it enter and leave the same segment of the cord. |
| Which is the only plexus that contains fibers from the thoracic region of the spinal cord? | Brachial |
| Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. | Vagus |
| The spinal tract that is located in the side of the cord, originates in the brain, and terminates in the spinal cord is the _____ tract. | lateral corticospinal |
| Which of the following is not associated with the oculomotor nerve? | Closing and opening of the eye (blink reflex) |
| Sympathetic responses generally have widespread effects on the body because: | preganglionic fibers synapse with several postsynaptic fibers. |
| Afferent nerves or fibers are found only in the _____ nervous system. | Sensory and Autonomic |
| The cerebellum performs all of the following functions except: | controls cardiac function. |
| Which is(are) the neurotransmitter(s) in a somatic motor pathway? | Acetylcholine |
| Nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the _____ plexus. | coccygeal |
| Damage to the _____ nerve could make the diaphragm unable to function. | Phrenic |
| Propranolol is an example of a: | Beta blocker Drug used to treat irregular heartbeats drug used to treat hypertension |
| Audition is a function of the _____ lobe. | Temoral |
| Cerebrospinal fluid circulates through the ventricles, into the central canal and _____, and is absorbed back into the blood. | subarachnoid space |
| The part of the brain that assists in the maintenance of balance is the: | cerebellum. |
| Norepinephrine is liberated at: | most sympathetic postganglionic nerve endings. |
| Normal infants will show the Babinski reflex up to the age of _____ years. | 1.5-2 years |
| All of the following cranial nerves are involved in proprioception except the | Vagus |
| If the ventral nerve root of a spinal nerve were destroyed, a person would lose _____ related to that pathway. | willed movement |
| Most effectors of the autonomic nervous system are dually innervated by sympathetic and parasympathetic neurons. | TRUE |
| Which is true of the dorsal nerve root? | It is also called the posterior root. It includes the spinal ganglion. It includes sensory fibers. |
| All of the following are examples of parasympathetic stimulation except: | Increased heart rate |
| Cerebrospinal fluid is formed by filtration of blood in the: | choroid plexuses. |
| Which of the following is not true of the knee jerk reflex? | Flexor reflex |
| Which of the following is a correct statement? | There are 5 lumbar nerve pairs. |
| Which of the following is a description of the principle of autonomic antagonism as it relates to the autonomic nervous system? | If sympathetic impulses tend to stimulate an effector, parasympathetic impulses tend to inhibit it. |
| Which of the following is not a function of the hypothalamus? | Regulation of motor activity |
| Acetylcholine can stimulate _____ receptors. | nicotinic |
| The part of the brain that can directly influence or inhibit the release of hormones from the pituitary is the: | Hypothalamus |
| Somatic motor and autonomic pathways share all of the following characteristics except: | number of neurons between central nervous system (CNS) and effector. |
| Which of the following is not an example of sympathetic stimulation? | Constriction of the bronchioles |
| Which of the following is true about pain receptors? | Alpha fibers are associated with sharp, localized pain. |
Created by:
JMcKay86
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