Introduction to nervous system video quiz

Question 1

In a reflex, what neurons relay sensory information from a receptor to the control center?

Answer 1

afferent neurons

Question 2

What division of the peripheral nervous system is under voluntary control and sends commands to excite contraction of skeletal muscles?

Answer 2

somatic efferent

Question 3

What component of a reflex are interneurons within the spinal cord and brain?

Answer 3

control center

Question 4

What component of the withdarwal reflex are the skeletal muscles that produce movement?

Answer 4

effector

Question 5

What is a collection of neuronal cell bodies in the peripheral nervous system?

Answer 5

ganglion

Question 6

What structure in the peripheral nervous system contains the cell bodies of sensory neurons?

Answer 6

dorsal root ganglion

Question 7

What structure in the spinal cord contains the cell bodies of somatic motor neurons?

Answer 7

anterior grey horn

Question 8

What is a bundle of afferent and efferent fibers in the peripheral nervous system?

Answer 8

nerve

Question 9

What is a collection of neuronal cell bodies deep within the brain or spinal cord?

Answer 9

nucleus

Question 10

What structural classification are the somatic efferent neurons found in the anterior gray horn of the spinal cord?

Answer 10

multipolar

Question 11

What glial cells myelinate axons in white matter tracts?

Answer 11

oligodendrocytes

Question 12

What structural classification are the afferent neurons found in the dorsal root ganglion?

Answer 12

pseudounipolar

Question 13

What glial cells myelinate axons in the nerves of the peripheral nervous system?

Answer 13

schwann cells

Question 14

What glial cells are found in the dorsal root ganglion surrounding the soma of afferent neurons to regulate their chemical environment?

Answer 14

satellite cells

Question 15

What part of a neuron releases neurotransmitters from synaptic vesicles by exocytosis?

Answer 15

axon terminals

Question 16

What is the separation of charge across the plasma membrane?

Answer 16

membrane potential

Question 17

What change in the membrane potential occurs when a sodium channel opens?

Answer 17

depolarization

Question 18

What is a brief reversal of the membrane potential that rapidly spreads from the axon hillock to the axon terminals and stimulates the release of neurotransmitters?

Answer 18

action potential

Question 19

What ion channels open causing repolarization and hyperpolarization during the action potential?

Answer 19

voltage gated K+ channel

Question 20

What type of graded potential occurs when a neurotransmitter stimulates the opening of a ligand-gated sodium ion channel?

Answer 20

excitatory postsynaptic potential (EPSP)