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Physiology 7-8
| Question | Answer |
|---|---|
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| A synaptic knob would be located on a(n): | axon |
| 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. |
| 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. |
| The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? | Almost 300 times faster |
| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are | potassium |
| Which of the following is not used by the body as a neurotransmitter? | All of the above are used by the body as neurotransmitters. |
| The brief period during which a local area of an axon's membrane resists re-stimulation is called the __________ period. | refractor |
| Which of the following statements about amino acid neurotransmitters is incorrect? | They are all inhibitory neurotransmitters. |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| A synapse consists of: | all of the above. |
| There are two types of synapses—the electrical synapse and the __________ synapse. | chemical |
| When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: | saltatory conduction. |
| Compared with the outside of the neuron, the inside has a(n) ____ charge. | negative |
| The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium pump. |
| A term commonly used as a synonym for action potential is | nerve impulse. |
| Excitatory neurotransmitters are most likely to: | initiate an action potential |
| A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. | local |
| Impulses from the _____ play a part in arousing or alerting the cerebrum. | thalamus |
| Damage to the _____ nerve could make the diaphragm unable to function. | phrenic |
| The cerebellum acts with the _____ to produce skilled movement. | cerebrum |
| Most effectors of the autonomic nervous system are dually innervated by sympathetic and parasympathetic neurons. | True |
| 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 |
| Which of the following is not a function of the hypothalamus? | Regulation of motor activity |
| Which of the following is not an example of sympathetic stimulation? | Constriction of the bronchioles |
| Sympathetic responses generally have widespread effects on the body because | preganglionic fibers synapse with several postsynaptic fibers. |
| Danielle has sustained an injury that has reduced her ability to complete simple tasks such as lifting a pencil, manipulating eating utensils, and brushing her hair. The injury has affected the _____ motor pathways _____ the central nervous system (CNS). | voluntary; outside |
| The knee jerk can be classified as a segmental reflex because: | impulses that mediate it enter and leave the same segment of the cord. |
| The part of the brain that assists in the maintenance of balance is the: | cerebellum |
| Once inside the sympathetic chain ganglion, the preganglionic fiber may: | do all of the above |
| Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. | vagus |
| Normal infants will show the Babinski reflex up to the age of _____ years. | 1.5-2 |
| Which of the following is not associated with the oculomotor nerve? | Closing and opening of the eye (blink reflex) |
| Which is(are) the neurotransmitter(s) in a somatic motor pathway? | Acetylcholine |
| The cerebellum performs all of the following functions except: | controls cardiac function |
| All of the following are examples of parasympathetic stimulation except: | increased heart rate. |
| If the dorsal root ganglia of the spinal nerve were destroyed, a person would lose _____ related to that pathway. | sensory perception |
| Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. | vagus |
Created by:
zaharazarina