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ap chap 11
fundamentals of nervous system and nervous tissue
| Question | Answer |
|---|---|
| which of the following is not a special characteristic of neurons? | they are mitotic |
| which of the choices below describes the ANS | motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands |
| which of the following is not true of graded potentials? | they increase amplitude as they move away from the stimulus point |
| which of the following is not a function of the autonomic nervous system? | innervation of skeeletal muscle |
| schwann cells are functionally similar to___ | oligodendrocytes |
| a neron that has as its primary function the job of connecting other neurons is called an___ | association neuron |
| what is the role of acetylcholinesterase? | destroy ACh a breif period after its release by the axon endings |
| collections of nerve cell bodies outside the central nervous system are called____. | ganglia |
| the period after an initial simulus when a neron is not sensitive to another stimulus is the___ | absolute refractor period |
| nerve cell adhesion molecules (N-CAMs)___ | are crucial for the development of neural connections |
| which of the following is not a chemical class of neurotransmitters? | nucleic acid |
| which of the following is not a function of astrocytes? | provide the defense for the CNS |
| whici of the following is true about the movment of ions across excitable living membranes? | some ions are prevented from moving down their concentration gradients by ATP driven pumps |
| a second nerve impulse cannot be generated until___ | the membrane potential has been reestablished |
| an impulse from one nerve cell is communicated to another nerve cell via the___ | synapse |
| neuroglia that control the chemical enviroment around neurons by buffering potassium and recapturing neurotransmitters are___ | astrocytes |
| which ofthe following describes the nervous system integrative function? | analyzes sensory information, stores information, makes decisions |
| which of the following will occur when an excitatory postsynaptic potential (ESSP) is being generated on the dendritic membrane? | a single type of channel will open, permitting simultaneous flow of soium and potassium. |
| the substance release at axon terminals to propagate a nervous impulse is called | neurotransmitter |
| when a sensory neuron is excited by some form of energy the resulting graded potential is called an____ | generator potential |
| salatory conduction is made possible by___ | the myelin sheath |
| the term central nervous system refers to the___ | brain and spinal cord |
| Neurons may be classified according to several characteristics. which ofthe following is correct? | group cfibers are not capable of salatory conduction. |
| ependymal cells____ | help to circulate the cerebrospinal fluid |
| which of the following is an excitatory nerotransmitter secreted by motor neurons innervating skeletal muscles? | acetylcholine |
| the sheath of schwann is also called the ___ | neurilemma |
| which of the following is false or incorrect? | a nerve impulse occurs if the excitatory and inhibitory effects are equal |
| an inhibitory ostsynaptic potential (IPSP) is associated with____ | hyperpolarization |
| select the correct statement about serial processing. | spinal reflexes are an example of serial processing |
| immedeiately after an action potential has peaked, which cellualar gates open? | potassium |
| what are ciliated CNS neuroglia that play an active role in moving the cerebrospinal flued called? | ependymal cells |
| bipolar neurons are commonly ___ | found in the retina of the eye |
| in what way does the interior surface of a cell membrane of a reasting(nonconducting) neuron differ from the external enviroment? the interior is___ | negatively charged and contains less sodium |
| the part of a neuron that conducts impulses away from its cell body is called a | axon |
| select the correct statment regarding synapses | the synaptic cleft prevents an impulse from being transmitted directly from one neuron to another. |
| if a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon___ | the impulse would spread bidirectionally |
| which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials? | volatage gated channel |
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