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Anatomy
Nervous system
| Question | Answer |
|---|---|
| Myelinated fibers (tracts) form ________ matter while unmyelinated fibers form ________ matter. a. sensory; motor b. gray; white c. motor; sensory d. white; gray | d. white; gray |
| After repolarization, what ions are pumped out of the cell? a. Sodium b. Potassium c. Both sodium and potassium d. Calcium | a. Sodium |
| Which ion causes neurotransmitter vesicles to fuse with the axon's membrane during the conduction of a nerve impulse from one neuron to the next? a. Chlorine b. Sodium c. Potassium d. Calcium | d. Calcium |
| The gap between two communicating neurons is termed ________. a. synaptic cleft b. cell body c. effector d. node of Ranvier | a. synaptic cleft |
| Which of the following terms indicates a nerve impulse has been initiated and is being transmitted? a. Graded potential b. Action potential c. Repolarization d. Local depolarization | b. Action potential |
| What type of neuron connects sensory and motor neurons in neural pathways? a. Interneurons (association neurons) b. Afferent neurons c. Efferent neurons d. Bipolar neurons | a. Interneurons (association neurons) |
| What cells form the myelin sheaths around nerve fibers in the PNS? a. Satellite cells b. Ependymal cells c. Schwann cells d. Microglial cells | c. Schwann cells |
| Support cells in the central nervous system are collectively called ________. a. myelin sheaths b. neuroglia c. oligodendrocytes d. microglia | b. neuroglia |
| The part of the neuron that typically conducts nerve impulses away from the cell body is the ________. a. dendrite b. cell body c. synaptic cleft d. axon | d. axon |
| A polarized neuron is characterized by the presence of more ________ ions outside the cell and less ________ ions along the plasma membrane inside the cell. a. calcium; sodium b. sodium; potassium c. potassium; sodium d. sodium; calcium | b. sodium; potassium |
| Cerebrospinal fluid is formed from blood by clusters of capillaries in the brain known as ________. a. choroid plexuses b. arachnoid villi c. ventricles d. sinuses | a. choroid plexuses |
| What brain dysfunction results when blood supply to a region of the brain is blocked and vital brain tissue dies, as by a blood clot or a ruptured blood vessel? a. Cerebrovascular accident (CVA) or stroke b. Parkinson's disease c. Huntington's disease | a. Cerebrovascular accident (CVA) or stroke |
| The brain and spinal cord are protected and cushioned by three connective tissue membranes that are collectively called ________. a. Ventricles b. arachnoid villi c. meninges d. sinuses | c. meninges |
| What are the two main functional subdivisions of the nervous system? a. Central and peripheral b. Somatic and autonomic c. Sensory and motor d. Autonomic and sympathetic | c. Sensory and motor |
| The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________. a. synaptic clefts b. axon terminals c. nodes of Ranvier d. myelin sheaths | c. nodes of Ranvier |
| Structural nervous system subdivision that consists of the brain and spinal cord? A) autonomic nervous system (ANS) B) peripheral nervous system (PNS) C) central nervous system (CNS) D) sensory (afferent) division E) motor (efferent) division | C) central nervous system (CNS) |
| Functional nervous system subdivision that carries information toward the central nervous system from sensory receptors? A) autonomic nervous system (ANS) B) peripheral nervous system (PNS) D) sensory (afferent) division E) motor (efferent) division | D) sensory (afferent) division |
| Structural nervous system subdivision that consists of spinal nerves and cranial nerves? A) autonomic nervous system (ANS) B) peripheral nervous system (PNS) C) central nervous system (CNS) D) sensory (afferent) division E) motor (efferent) division | B) peripheral nervous system (PNS) |
| Subdivision of the motor division responsible for controlling involuntary events? A) autonomic nervous system (ANS) B) peripheral nervous system (PNS) C) central nervous system (CNS) D) sensory (afferent) division E) motor (efferent) division | A) autonomic nervous system (ANS) |
| Functional nervous system division that carries information from the central nervous system toward effectors? A) autonomic nervous system (ANS) B) peripheral nervous system (PNS) D) sensory (afferent) division E) motor (efferent) division | E) motor (efferent) division |
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