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Nerve
Neural tissue
| Question | Answer |
|---|---|
| Which of the following is not a function of the nervous system? | direct long-term functions, such as growth |
| The ________ nervous system is composed of the brain and spinal cord. | central |
| The ________ nervous system controls the skeletal muscles. | Somatic |
| The part of the peripheral nervous system that carries sensory information to the CNS is designated | Afferent |
| Which of the following is not a function of the neuroglia? | Memory |
| Which of the following are a type of glial cell found in the peripheral nervous system? | satellite cells |
| The largest and most numerous of the glial cells in the central nervous system are the | astrocytes |
| Functions of astrocytes include all of the following, except | conducting action potentials. |
| The myelin sheath that covers many CNS axons is formed by | oligodendrocytes |
| ________ line the brain ventricles and spinal canal. | Ependymal cells |
| Small, wandering cells that engulf cell debris and pathogens in the CNS are called | microglia |
| The neurilemma of axons in the peripheral nervous system is formed by | Schwann cells. |
| Glial cells that surround the neurons in ganglia are | satellite cells |
| Which of the following is not a recognized structural classification for neurons? | pseudopolar |
| The most abundant class of neuron in the central nervous system is | multipolar |
| Clusters of RER and free ribosomes in neurons are called | Nissl bodies. |
| The cytoplasm that surrounds the nucleus of a neuron is called the | perikaryon |
| The axon is connected to the soma at the | axon hillock |
| Axons terminate in a series of fine extensions known as | telodendria |
| The site of intercellular communication between neurons is the | Synapse |
| The rabies virus travels to the CNS via | retrograde axoplasmic transport. |
| Neurons that are rare, small, and lack features that distinguish dendrites from axons are called | anaxonic |
| Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called | Unipolar |
| Neurons that have one axon and one dendrite, with the soma in between, are called | Bipolar |
| Neurons that have several dendrites and a single axon are called | Multipolar |
| Sensory neurons of the PNS are | Unipolar |
| Which of the following activities or sensations is not monitored by interoceptors? | Sight |
| Which of the following is not involved in creating the resting potential of a neuron? | membrane permeability for sodium ions greater than potassium ions |
| Which of the following interactions between electrical and chemical gradients does not lead to the establishment of a neurons resting potential? | Electrical forces push sodium ions out of the cell |
| At the normal resting potential of a typical neuron, its Na-K ion exchange pump transports | 3 intracellular sodium ions for 2 extracellular potassium ions. |
| Ion channels that are always open are called ________ channels. | Leak |
| Opening of sodium channels in the axon membrane causes | depolarization and increased positive charge inside the membrane. A and D |
| Voltage-gated channels are present | in the membrane that covers axons |
| The following are the main steps in the generation of an action potential. | 4, 6, 7, 1, 2, 3, 5 |
| The sodium-potassium ion exchange pump | moves sodium and potassium opposite to the direction of their electrochemical gradients. |
| The all-or-none principle states that | all stimuli great enough to bring the membrane to threshold will produce identical action potentials |
| _______ are the most numerous type of neuron in the CNS | Interneurons |
| The axon is connected to the soma at the | axon hillock |
| Which of the following does not influence the time necessary for a nerve impulse to be transmitted? | whether or not the impulse begins in the CNS |
| Which of the following comparisons between neurons and muscle tissue is false? | Action potentials are briefer in muscle fibers |
| ) Which type of synapse is most common in the nervous system | chemical |
| The ion that triggers the release of acetylcholine into the synaptic cleft is | Calcium |
| If the chemically gated sodium channels in the postsynaptic membrane were completely blocked | synaptic transmission would fail |
| The same ________ can have different effects depending on the properties of the ________ | neurotransmitter; receptor |
| ) Raising the potassium ion concentration in the extracellular fluid surrounding a nerve cell will have which effect? | depolarize it |
| The smallest neuroglia of the CNS are the | microglia |
| The largest and most numerous neuroglia in the CNS are the | astrocytes |
| The function of the astrocytes in the CNS includes which of the following? | all |
| account for roughly half of the volume of the nervous system | Neuroglia |
| _ are the most numerous type of neuron in the CNS | Interneurons |
| In a(n) ________ neuron, the dendrites and axon are continuous or fused | Unipolar |
| neurons are short, with a cell body between dendrite and axon, and occur in special sense organs | Bipolar |
Created by:
y2420