A P I (BIO 211) Unit 14 WS #4 Question 1 What is the most common type of neuron? Question 2 What system keeps the neuron at resting potential?

1. A & P I (BIO 211) Unit 14  WS #4

Question 1

• What is the most common type of neuron?

Question 2

• What system keeps the neuron at resting potential?

Question 3

• About 90% of the neurons in the nervous system are __________ neurons.

Question 4

• Which glial cell is found wrapped around nerve fibers in the PNS?

Question 5

• In a neuron, the opening of sodium gates typically leads to __________.

Question 6

• Within the peripheral nervous system, the myelin sheath is formed by

Question 7

• During depolarization

Question 8

• What property of neurons allows them to respond to changes in the environment?

Question 9

• Which of the following are effectors?

Question 10

• What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

Question 11

• The process of nerve signal conduction is termed an action potential.

Question 12

• Gaps in the myelin sheath are called nodes of Ranvier.

Question 13

• If the potassium leak channels were suddenly blocked in a resting neuron, what would happen to its resting membrane potential?

Question 14

• What flows across the synaptic cleft?

Question 15

• A sensory neuron carries impulses

Question 16

• When a neuron is stimulated, Na + gates open and allow Na + to exit the cell.

Question 17

• Which of the following is true regarding unmyelinated nerve fibers in the PNS?

Question 18

• The nervous system employs exclusively electrical means to send messages, whereas the endocrine system communicates by means of chemical messengers.

Question 19

• The resting potential of a neuron is measured at

Question 20

• The respiratory center gathers information from a variety of sources in order to set the rate and depth of breathing. This is an example of what type of neural circuit?

Question 21

• The "jumping" of an action potential from one node of Ranvier to the next node is called

Question 22

• While both systems maintain homeostasis, how does the nervous system differ from the endocrine system?

Question 23

• What does the action potential consist of?

Question 24

• Oligodendrocytes serve the same purpose in the CNS that satellite cells do in the PNS. T or F

Question 25

• What triggers the release of a neurotransmitter from the presynaptic neuron vesicles?

Question 26

• Cerebrospinal fluid fills the space between the __________.

Question 27

• The upper motor neurons that control skeletal muscles begin with a soma in the __________.

Question 28

• Motor commands are carried by __________ from the brain along the spinal cord.

Question 29

• Which of the following nerves originates in the lumbosacral plexus?

Question 30

• Epidural anesthesia is introduced to the epidural space between the __________ to block pain signals during pregnancy.

Question 31

• The structure found between the posterior rootlets and the posterior root ganglion is called the __________.

Question 32

• Ascending signals in the spinal cord travel via gray matter, while descending signals travel via white matter.

Question 33

• Which reflex shows the least synaptic delay?

Question 34

• Voluntary motor signals typically begin in an upper motor neuron in the thalamus.

Question 35

• Reflex arcs that only use two neurons are called ____________ reflex arcs.

Question 36

• A ganglion is a _________.

Question 37

• A ganglion is a swelling along a nerve containing the cell bodies of peripheral neurons.

Question 38

• Which of the following is contained within gray matter?

Question 39

• Which of the following structures is the richest in lipid content?

Question 40

• Cervical and lumbar enlargements are wide points in the spinal cord marking the emergence of motor nerves.

Question 41

• The middle layer of the meninges is called the __________.

Question 42

• In the patellar tendon reflex arc, the patellar ligament is stretched, which stretches the quadriceps femoris muscle of the thigh. This reflex will cause the quadriceps femoris to __________ and the hamstrings to __________.

Question 43

• Second-order neurons synapse with third-order neurons in the __________.

Question 44

• Nerve fibers are insulated from one another by __________.

Question 45

• A nerve fiber is enclosed in its own fibrous sleeve called perineurium.

Question 46

• A reflex in which the sensory input and motor output are on opposite sides of the spinal cord, is called a(n) _________ reflex arc.

Question 47

• Many upper motor neurons synapse with lower motor neurons in the ___________.

Question 48

• There are __________ pairs of spinal nerves.

Question 49

• The blood-brain barrier (BBB) helps prevent hemorrhages in the nervous tissue of the brain.

Question 50

• The pineal gland is part of which larger region of the brain?

Question 51

• The cerebellum exhibits folds called gyri separated by grooves called sulci.

Question 52

• Structures in the midbrain control homeostasis and relay sensory signals to specific regions of the cerebral cortex.

Question 53

• Which of the following is not a function of CSF?

Question 54

• What is the largest of the cranial nerves and the most important sensory nerve of the face?

Question 55

• Which structures create the blood brain barrier (BBB)?

Question 56

• The great majority of which tracts pass through the corpus callosum?

Question 57

• The reticular formation is a web of __________ scattered throughout the __________.

Question 58

• Which of the following structures does not contain CSF?

Question 59

• The following are all major components of the brainstem except the _________.

Question 60

• The medulla oblongata is the most rostral part of the brain.

Question 61

• Which lobe is deep to the lateral sulcus and can only be seen by removing some of the overlying cerebrum?

Question 62

• The thalamus, hypothalamus, and epithalamus are derivatives of which embryonic structure?

Question 63

• There are no cranial nerves associated with which part of the brain?

Question 64

• The __________ function(s) in visual attention, such as to look and follow the flight of a butterfly.

Question 65

• Which of the following is correct regarding the occipital lobe?

Question 66

• The medulla oblongata originates from which structure?

Question 67

• The cerebellum is the largest part of the brain.

Question 68

• Nearly all the somatosensory input to the cerebrum passes by way of synapses in which region of the brain?

Question 69

• Planning, motivation, and social judgment are functions of the brain associated with which part of the cerebrum?

Question 70

• The pons and cerebellum arise from which secondary embryonic vesicle?

Question 71

• The forebrain consists of the cerebrum and the diencephalon.

Question 72

• Which of the following structures appears as a large bulge just rostral to the medulla?

Question 73

• A possible explanation for the effect of caffeine is that it blocks the receptor for a neuromodulator in the brain called __________, which inhibits ACh release by cholinergic neurons.

Question 74

• If a cell has α 1 adrenergic receptors, it is sensitive to __________.

Question 75

• 1 out of 1 points
• Which one of the following best describes the order of a visceral reflex?

Question 76

• Sympathetic effects tend to last __________ than parasympathetic effects. One reason is that __________.

Question 77

• The autonomic nervous system controls all of the following except the __________.

Question 78

• The autonomic nervous system carries out many somatic reflexes that are crucial to homeostasis.

Question 79

• The neurotransmitter(s) associated with autonomic ganglia is (are) __________.

Question 80

• All sympathetic postganglionic adrenergic fibers secrete adrenaline.

Question 81

• Propranolol, a beta-blocker, is typically used to __________.

Question 82

• The motor pathway of the autonomic nervous system usually involves __________ neurons.

Question 83

• Antagonistic effects of the two divisions of the autonomic nervous system are exemplified in the control of __________.

Question 84

• Preganglionic fibers of the autonomic efferent pathway are _________ and secrete __________.

Question 85

• Acetylcholine (ACh) binds to both muscarinic and nicotinic receptors.

Question 86

• The adrenal medulla is a modified sympathetic ganglion.

Question 87

• Which of the following is not a characteristic of the enteric nervous system?

Question 88

• All autonomic output originates in the central nervous system.

Question 89

• Autonomic function receives input from all these except __________.

Question 90

• Which of the following is true regarding the autonomic nervous system?

Question 91