Bio 20 lecture exam 3 questions with well detailed answers guaranteed pass.

1. Small masses of neuron cell bodies located outside the CNS are called A) interneurons. B) plexuses. C) nerves. D) ganglia. E) nuclei. - correct answer D) ganglia. 2. The substance released at axonal endings to propagate a nervous impulse is called a A) ion. B) cholinesterase. C) neurotransmitter. D) biogenic amine. - correct answer C) neurotransmitter. 3. Neuroglia that are positioned between neurons and capillaries to form part of the blood-brain barrier are the A) astrocytes. B) oligodendrocytes. C) microglia. D) ependymal cells. E) Schwann cells. - correct answer A) astrocytes. 4. The autonomic nervous system is divided into A) somatic and sympathetic nervous systems. B) afferent and efferent nervous systems. C) sympathetic and parasympathetic nervous systems. D) central nervous system and peripheral nervous system. - correct answer C) sympathetic and parasympathetic nervous systems. 5. Synaptic vesicles store A) glycogen for energy production. B) lipofuscin. C) neurotransmitter. D) calcium ions. E) enzymes fore degrading neurotransmitter. - correct answer C) neurotransmitter. 6. The site of communication between two neurons is called a A) Nissl body. B) synapse. C) varicosity. D) dendrite. E) All are correct. - correct answer B) synapse. 7. Neurons that have one main dendrite and one axon are called A) multipolar neurons. B) bipolar neurons. C) unipolar neurons. D) monopolar neurons. E) neuroglia. - correct answer B) bipolar neurons. 8. Gaps in the myelin sheath are called A) oligodendrocytes. B) Nodes of Ranvier. C) Sheath of Schwann. D) gliomas. - correct answer B) Nodes of Ranvier 9. White matter of the nervous system is composed of A) aggregations of myelinated axons. B) aggregations of cell bodies. C) aggregations of nuclei of cell bodies. D) aggregation of ganglia. E) All are correct. - correct answer A) aggregations of myelinated axons. 10. Ion channels open and close due to the presence of A) ligands. B) lids. C) gates. D) doors. - correct answer C) gates. 11. The plasma membrane of a neuron is more permeable to potassium ions than to sodium ions because the membrane has A) more voltage-gated sodium ion channels. B) more ligand-gated potassium ion channels. C) more potassium leakage channels. D) fewer voltage-gated sodium ion channels. E) more carrier molecules for potassium ions. - correct answer C) more potassium leakage channels. 12. Afferent nerves conduct nerve impulses from A) the central nervous system to effectors. B) effectors to the central nervous system. C) receptors to the central nervous system. D) the central nervous system to receptors. E) one effector to another. - correct answer C) receptors to the central nervous system. 13. The branch of a neuron that carries a nerve impulse away from the cell body is the A) axon. B) dendrite. C) perikaryon. D) Nissl body. E) Node of Ranvier. - correct answer A) axon. 14. What would normally be found within the central canal of the spinal cord? A) blood B) myelin C) cerebrospinal fluid D) air E) gray matter - correct answer C) cerebrospinal fluid 15. What would normally be found immediately surrounding central canal of the spinal cord? A) white matter B) gray matter C) cerebrospinal fluid D) the pia mater E) the dura mater - correct answer B) gray matter 16. In the adult, the spinal cord extends from the medulla to the A) coccyx. B) sacral promontory. C) point of attachment of the most inferior pair of ribs. D) sacral hiatus. E) upper border of vertebra L2. - correct answer E) upper border of vertebra L2. 17. To do a lumbar puncture, the needle is inserted into the A) central canal. B) sacral plexus. C) nucleus pulposus. D) subarachnoid space. E) gray commissure. - correct answer D) subarachnoid space. 18. The nerve that stimulates the diaphragm to contract arises from the A) cervical plexus. B) lumbar plexus. C) brachial plexus. D) sacral plexus. E) intercostal nerves. - correct answer A) cervical plexus. 19. The nerve that stimulates the diaphragm to contract is the A) median nerve. B) phrenic nerve. C) sciatic nerve. D) radial nerve. E) second intercostal nerve. - correct answer B) phrenic nerve 20. The endoneurium is the A) lining of the central canal of the spinal cord. B) space between the pia mater and the spinal cord. C) connective tissue surrounding an individual axon. D) connective tissue surrounding an entire nerve. E) group of neurons forming a spinal tract. - correct answer C) connective tissue surrounding an individual axon. 21. The spinal cord is suspended in the middle of its dural sheath by A) ascending spinal tracts. B) the cauda equina. C) cerebrospinal fluid. D) denticulate ligaments. E) epidural fat. - correct answer D) denticulate ligaments. 22. The innermost layer of the meninges is the A) dura mater. B) arachnoid. C) pia mater. D) gray commissure. E) conus medullaris. - correct answer C) pia mater. 23. The spinal cord is continuous with the A) occipital bone. B) cerebral cortex. C) medulla oblongata. D) thalamus. E) coccyx. - correct answer C) medulla oblongata. 24. The cavities within the brain are called A) sulci. B) choroid plexuses. C) nuclei. D) ventricles. E) commissures. - correct answer D) ventricles 25. Fine control of body coordination and balance is a function of the A) cerebellum. B) hypothalamus. C) thalamus. D) pituitary gland. E) reticular activating system. - correct answer A) cerebellum. 26. The type of neuroglia that wrap around capillaries in the blood-brain barrier are the A) astrocytes. B) Schwann cells. C) oligodendrocytes. D) microglia. E) ependymal cells. - correct answer A) astrocytes. 27. The brain stem is made up of the A) cerebellum, pons, and hypothalamus. B) medulla oblongata, thalamus, and midbrain. C) medulla oblongata, hypothalamus, and pons. D) medulla oblongata, pons, and midbrain. E) midbrain, hypothalamus, and thalamus. - correct answer D) medulla oblongata, pons, and midbrain 28. Which of the following is NOT TRUE for cerebrospinal fluid? A) It acts as a shock absorber for the brain. B) It may contain white blood cells. C) It is a medium for exchange of nutrients and wastes. D) It acts as a neurotransmitter in the brain. E) It is produced by filtration and secretion in choroid plexuses. - correct answer D) It acts as a neurotransmitter in the brain. 29. Superior to the hypothalamus and between the halves of the thalamus is the A) subthalamus. B) third ventricle. C) fourth ventricle. D) superior sagittal sinus. E) midbrain. - correct answer B) third ventricle 30. The function of a choroid plexus is to A) receive sensations from the viscera. B) send motor impulses to the diaphragm. C) produce cerebrospinal fluid. D) reabsorb cerebrospinal fluid. E) transmit impulses from one cerebral hemisphere to the other. - correct answer C) produce cerebrospinal fluid 31. The function of arachnoid villi is to A) reabsorb cerebrospinal fluid. B) produce cerebrospinal fluid. C) hold the meninges onto the brain. D) provide nourishment for neurons in the CNS. E) conduct impulses from one cerebral hemisphere to the other. - correct answer A) reabsorb cerebrospinal fluid 32. White fibers that transmit impulses between corresponding gyri in opposite cerebral hemispheres are called A) association fibers. B) projection fibers. C) commissural fibers. D) ganglia. E) choroid plexuses. - correct answer C) commissural fibers. 33. The reason hydrocephalus is so dangerous is that A) too many toxic products flood the brain. B) Excess cerebrospinal fluid puts pressure on neurons, damaging them. C) the brain dehydrates. D) bacteria can grow more easily in accumulated fluid. E) it causes excessive release of hormones from the hypothalamus. - correct answer B) Excess cerebrospinal fluid puts pressure on neurons, damaging them 34. Between the foramen magnum and the pons is the A) pituitary gland. B) hypothalamus. C) cerebellum. D) medulla oblongata. E) midbrain. - correct answer D) medulla oblongata. 35. The left side of the cerebrum controls skeletal muscles on the right side of the body because motor neurons cross from left to right in the A) precentral gyrus. B) cerebellum. C) medulla oblongata. D) hypothalamus. E) thalamus. - correct answer C) medulla oblongata. 36. The primary motor area of the cerebral cortex is located in the A) precentral gyrus. B) postcentral gyrus. C) temporal lobe. D) occipital lobe. E) insula. - correct answer A) precentral gyrus. 37. The primary visual area and visual association area of the cerebral cortex are both located in the A) frontal lobe. B) temporal lobe. C) parietal lobe. D) insula. E) occipital lobe. - correct answer E) occipital lobe 38. Converting thoughts to spoken words is a complex activity that are located in the A) Broca's area. B) Wernicke's area. C) common integrative area. D) premotor area. E) All answers are correct. - correct answer A) Broca's area. 39. Light is an appropriate stimulus for A) thermoreceptors. B) mechanoreceptors. C) chemoreceptors. D) photoreceptors. E) Both A and D are correct. - correct answer D) photoreceptors. 40. The conscious awareness and interpretation of sensations is called A) modality.