NBDHE EXAM ACTUAL
EXAM 2025 | NATIONAL BOARD
DENTAL HYGIENE EXAMINATION
| COMPLETE QUESTIONS AND
CORRECT ANSWERS WITH
EXPLANATIONS
Which part of the nervous system contains centers that regulate
the autonomic nervous system - ANSWER:-->//hypothalamus
which nerve carries most of the parasympathetic output from the
brain - ANSWER:-->//vagus
exteroceptors - ANSWER:-->//monitor external environment
proprioceptors - ANSWER:-->//monitor body position
nociceptors - ANSWER:-->//detect pain
mechanoreceptors - ANSWER:-->//detect pressure
functions of tears - ANSWER:-->//moisten the eye
wash away eye irritants
,destroy certain bacteria
lubricate the eye
transmission of vibration from the tympanic membrane to the
oval window is accomplished by - ANSWER:-->//the auditory
ossicles
which structure refracts light rays entering the eye - ANSWER:-
->//cornea
a female who is sluggish, gaining weight, and has a low body
temperature may be having problems with her - ANSWER:--
>//thyroid gland
a patient exhibiting liver failure would tend to have a -
ANSWER:-->//higher than normal blood levels of circulating
hormones
symptoms of hypoparathyroidism - ANSWER:-->//twitches,
spasms of skeletal muscles
what is the purpose of hematocrit - ANSWER:-->//determines
the percentage of red blood cells in whole blood
primary function of erythrocytes is to - ANSWER:-->//deliver
oxygen to the cells of the body
in a person with blood type A, the isoantibody that would
normally be present in the plasma is - ANSWER:-->//anti-b
antibody
,vitamin K is required for what? and deficiency causes what? -
ANSWER:-->//prothrombin and three other clotting factors
causes uncontrolled bleeding
a thrombus that is being transported by the bloodstream is called
- ANSWER:-->//an embolus
the blood vessels that allow the exchange of nutrients, wastes,
oxygen, and carbon dioxide between the blood and tissues are
the - ANSWER:-->//capillaries
pulmonary circulation as the blood flows from the right ventricle
- ANSWER:-->//pulmonary trunk-pulmonary arteries-
pulmonary capillaries-pulmonary veins
the characteristic of arteries that allows them to stretch is -
ANSWER:-->//elasticity
function of lymph nodes - ANSWER:-->//to filter lymph
the cells that attack and destroy foreign agents such as fungi,
parasites, cancer cells, and foreign tissues are - ANSWER:-->//t
cells
the ability of the body's immune system to recognize its own
tissue is known as - ANSWER:-->//immunologic tolerance
most chemical digestion occurs in the - ANSWER:-->//colon
the smell of your favorite food makes "your mouth water"; this
reaction is caused by - ANSWER:-->//parasympathetic
stimulation of the salivary glands
, a function of bile - ANSWER:-->//emulsifies triglycerides
purpose of villi in the small intesine - ANSWER:-->//increase
the surface area for the absorption of digested nutrients
functional component of the kidney - ANSWER:-->//nephron
systemic complications associated with renal failure -
ANSWER:-->//cardiovascular
neuromuscular
hematologic
functions of the kidney - ANSWER:-->//eliminate waste from
blood
release hormones
regulate potassium and sodium levels
muscles of mastication are attached to what landmark on the
sphenoid bone - ANSWER:-->//pterygoid process
an important nerve for dentistry that runs exclusively through
the sphenoid bone - ANSWER:-->//trigeminal nerve
cells that play a role in the resorption of bone - ANSWER:--
>//osteoclasts
best describes the alveolar process of the maxilla - ANSWER:--
>//the process is easily remodeled because of its lack of density
EXAM 2025 | NATIONAL BOARD
DENTAL HYGIENE EXAMINATION
| COMPLETE QUESTIONS AND
CORRECT ANSWERS WITH
EXPLANATIONS
Which part of the nervous system contains centers that regulate
the autonomic nervous system - ANSWER:-->//hypothalamus
which nerve carries most of the parasympathetic output from the
brain - ANSWER:-->//vagus
exteroceptors - ANSWER:-->//monitor external environment
proprioceptors - ANSWER:-->//monitor body position
nociceptors - ANSWER:-->//detect pain
mechanoreceptors - ANSWER:-->//detect pressure
functions of tears - ANSWER:-->//moisten the eye
wash away eye irritants
,destroy certain bacteria
lubricate the eye
transmission of vibration from the tympanic membrane to the
oval window is accomplished by - ANSWER:-->//the auditory
ossicles
which structure refracts light rays entering the eye - ANSWER:-
->//cornea
a female who is sluggish, gaining weight, and has a low body
temperature may be having problems with her - ANSWER:--
>//thyroid gland
a patient exhibiting liver failure would tend to have a -
ANSWER:-->//higher than normal blood levels of circulating
hormones
symptoms of hypoparathyroidism - ANSWER:-->//twitches,
spasms of skeletal muscles
what is the purpose of hematocrit - ANSWER:-->//determines
the percentage of red blood cells in whole blood
primary function of erythrocytes is to - ANSWER:-->//deliver
oxygen to the cells of the body
in a person with blood type A, the isoantibody that would
normally be present in the plasma is - ANSWER:-->//anti-b
antibody
,vitamin K is required for what? and deficiency causes what? -
ANSWER:-->//prothrombin and three other clotting factors
causes uncontrolled bleeding
a thrombus that is being transported by the bloodstream is called
- ANSWER:-->//an embolus
the blood vessels that allow the exchange of nutrients, wastes,
oxygen, and carbon dioxide between the blood and tissues are
the - ANSWER:-->//capillaries
pulmonary circulation as the blood flows from the right ventricle
- ANSWER:-->//pulmonary trunk-pulmonary arteries-
pulmonary capillaries-pulmonary veins
the characteristic of arteries that allows them to stretch is -
ANSWER:-->//elasticity
function of lymph nodes - ANSWER:-->//to filter lymph
the cells that attack and destroy foreign agents such as fungi,
parasites, cancer cells, and foreign tissues are - ANSWER:-->//t
cells
the ability of the body's immune system to recognize its own
tissue is known as - ANSWER:-->//immunologic tolerance
most chemical digestion occurs in the - ANSWER:-->//colon
the smell of your favorite food makes "your mouth water"; this
reaction is caused by - ANSWER:-->//parasympathetic
stimulation of the salivary glands
, a function of bile - ANSWER:-->//emulsifies triglycerides
purpose of villi in the small intesine - ANSWER:-->//increase
the surface area for the absorption of digested nutrients
functional component of the kidney - ANSWER:-->//nephron
systemic complications associated with renal failure -
ANSWER:-->//cardiovascular
neuromuscular
hematologic
functions of the kidney - ANSWER:-->//eliminate waste from
blood
release hormones
regulate potassium and sodium levels
muscles of mastication are attached to what landmark on the
sphenoid bone - ANSWER:-->//pterygoid process
an important nerve for dentistry that runs exclusively through
the sphenoid bone - ANSWER:-->//trigeminal nerve
cells that play a role in the resorption of bone - ANSWER:--
>//osteoclasts
best describes the alveolar process of the maxilla - ANSWER:--
>//the process is easily remodeled because of its lack of density
