Practice Quiz Unit 3

Question 1

According to Ohm’s law, current is

Answer 1

directly related to voltage and inversely related to resistance.

Question 2

The connective tissue wrapping that surrounds bundles (fascicles) of axons is the

Answer 2

perineurium

(NOT epineurium)

Question 3

The glial cell that myelinates and insulates axons within the CNS is the

Answer 3

oligodendrocyte

Question 4

The type of neuronal circuit in which several nerve impulses come together at a single postsynaptic neuron is a _____________ circuit.

Answer 4

converging

Question 5

The shallow depressions between folds on the surface of the brain are called

Answer 5

sulci.

Question 6

The medulla oblongata contains a cardiac center and a medullary respiratory center.

Answer 6

true

Question 7

What is the name of the brainstem sensory area that contains axons that project to the cerebral cortex to arouse us from sleep?

Answer 7

Reticular activating system

Question 8

The cerebral cortex consists of ______ matter.

Answer 8

gray

Question 9

Which cranial nerve is composed of only motor fibers?

Answer 9

VI

Question 10

The cell bodies of sensory neurons are located in the

Answer 10

posterior root ganglion.

Question 11

What is the thin strand of pia mater that helps to anchor the spinal cord to the coccyx?

Answer 11

Filum terminale

Question 12

Stepping on a piece of glass would most likely invoke a _____ reflex.

Answer 12

withdrawal

Question 13

The tapered, conical inferior end of the spinal cord is called the conus

Answer 13

medullaris

Question 14

The inferior tip of the spinal cord is the ___________ part.

Answer 14

coccygeal

Question 15

Which divisionfunctions to increase alertness and direct bodily responses in stressful situations?

Answer 15

Sympathetic

Question 16

Which type of innervation causes the heart rate to increase?

Answer 16

Sympathetic

Question 17

Neuronal ___ occurs when axons from numerous preganglionic cells synapse on a single ganglionic cell.

Answer 17

convergence

Question 18

The “fight-or-flight” system is the ___ nervous system.

Answer 18

sympathetic

Question 19

These receptors respond to changes in temperature.

Answer 19

Thermoreceptors

Question 20

Phototransduction is the process in which

Answer 20

photoreceptors convert light energy to changes in membrane potential.

Question 21

Our ability to precisely locate a stimulus is ___ proportional to receptive field size.

Answer 21

inversely

Question 22

A receptor that is wrapped in connective tissue is referred to as being

Answer 22

encapsulated

Question 23

Distortion of hair cells in the cochlea causes

Answer 23

initiation of action potentials in CN VIII

Question 24

The glossy-white appearance of most axons is due to

Answer 24

the high lipid content of the myelin sheath

Question 25

A mixed nerve is one that contains both

Answer 25

sensory and motor neurons.

Question 26

The type of neuronal circuit in which several nerve impulses come together at a single postsynaptic neuron is a _____________ circuit.

Answer 26

converging

Question 27

Conductive activity in a neuron generally causes it to secrete

Answer 27

a specific neurotransmitter that either excites or inhibits its target.

Question 28

Generally, the left cerebral hemisphere issues motor commands for the right side of the body.

Answer 28

true

Question 29

Which structure serves as the main relay point for sensory information that is headed to a primary sensory region of the cerebral cortex?

Answer 29

Thalamus

Question 30

The type of glial cell that plays a critical role in the formation of CSF is the ___ cell

Answer 30

ependymal

Question 31

Which is not a function of cerebrospinal fluid?

Answer 31

CSF helps to promote mitosis within neuronal tissue.

Question 32

Which secondary brain vesicle forms the portion of the adult brain that includes the epithalamus, thalamus, and hypothalamus?

Answer 32

Diencephalon

Question 33

The deepest and most delicate of the meninges, adhered directly to the spinal cord, consists of elastic and collagen fibers. It is called the

Answer 33

pia mater.

Question 34

Stepping on a piece of glass would most likely invoke a _____ reflex.

Answer 34

withdrawal

Question 35

The most inferior spinal nerve is

Answer 35

Co1.

Question 36

Motor pathways are _________ tracts that control _________.

Answer 36

descending; effectors

Question 37

The _______ nuclei within the gray matter of the spinal cord send nerve impulses to skeletal muscles.

Answer 37

somatic motor

Question 38

In the stress response, the process by which many structures are activated simultaneously is known as ___ activation.

Answer 38

mass

Question 39

White rami appear white in color due to the fact that they are

Answer 39

myelinated

Question 40

Which division functions to increase alertness and direct bodily responses in stressful situations?

Answer 40

Sympathetic

Question 41

Which division functions to conserve energy and replenish the supply of nutrients?

Answer 41

Parasympathetic

Question 42

These receptors respond to touch, pressure, vibration, and stretch.

Answer 42

Mechanoreceptors

Question 43

By definition, transducers

Answer 43

change one form of energy into another form.

Question 44

The gelatinous mass inside of the eye is called the

Answer 44

vitreous humor.

Question 45

The conjunctiva that lines the internal surface of the eyelids is termed the _____ conjunctiva.

Answer 45

palpebral

Question 46

Sharp, color vision is a result of the function of

Answer 46

cones.

Question 47

The function of myelin is to

Answer 47

produce faster nerve impulse propagation.

Question 48

A nerve

Answer 48

is a cablelike bundle of parallel axons

Question 49

The type of neuronal circuit that spreads information from one presynaptic neuron to several postsynaptic neurons is a _____________ circuit.

Answer 49

diverging

Question 50

The main way acetylcholine is cleared from a synapse is by

Answer 50

degradation by an enzyme

Question 51

Association tracts

Answer 51

connect different regions of the cerebral cortex within the same hemisphere

Question 52

The shallow depressions between folds on the surface of the brain are called

Answer 52

sulci

Question 53

The ______ hemisphere is known for its involvement in categorization, symbolization, and analytical reasoning.

Answer 53

left

Question 54

The cranial nerve that innervates smooth muscle and glands of the heart, lungs, larynx, trachea, and most abdominal organs is the ___________ nerve.

Answer 54

vagus

Question 55

The cell bodies of sensory neurons are located in the

Answer 55

posterior root ganglion.

Question 56

The nerves projecting inferiorly from the spinal cord are collectively called the

Answer 56

cauda equina.

Question 57

Motor neurons of the autonomic nervous system

Answer 57

can either excite or inhibit effector organs.

Question 58

The centers for cardiac, digestive, and vasomotor functions are housed within the

Answer 58

brainstem.

Question 59

When ACh binds to nicotinic receptors, it

Answer 59

always produces an excitatory response.

Question 60

The conjunctiva that lines the internal surface of the eyelids is termed the _____ conjunctiva.

Answer 60

palpebral

Question 61

A receptor that is wrapped in connective tissue is referred to as being ___

Answer 61

encapsulated

Question 62

Which sequence correctly traces the pathway of aqueous humor in the eye? a: Aqueous humor is secreted by epithelial ciliary cells. b: Aqueous humor is released into the posterior chamber. c: Aqueous humor is drained into the scleral venous sinus. d: Aqueous humor washes over the lens and then passes through the pupil into the anterior chamber.

Answer 62

a, b, d, c

Question 63

Which photoreceptor cells are more numerous?

Answer 63

Rods

Question 64

These receptors detect specific molecules in our external and internal environments.

Answer 64

Chemoreceptors