PNB 2274 EXAM 1 PRACTICE
QUESTIONS AND ANSWERS 100%
PASS
In the skull of a newborn baby, the space between the developing skull bones is known
as
a. Lacuna
b. Aversion canals
c. Fontanel
d. Intramembranous canal
e. Central canal - ✔✔c. Fontanel
You recently identified a disorder in which the activity of osteoblasts exceeds the
activity of osteoclasts. How will the properties of the long bone be affected?
a. The bone would have a reduced inorganic content; as a result it would be weaker and
more elastic.
Katelyn Whitman, All Rights Reserved © 2025 1
,b. The bone would have an increased inorganic content; as a result it would be weaker
and more elastic
c. The bone would have a reduced inorganic content; as a result it would be tougher
and less ductile.
d. The bone would have an increased inorganic content; as a result it would be tougher
and less ductile
e. The bone would have a reduced inorganic content; as a result it would sustain greater
compressive forces - ✔✔d. The bone would have an increased inorganic content; as a
result it would be tougher and less ductile
The method of mammary gland secretion is:
a. Apocrine
b. Mesocrine
c. Merocrine
d. Fullcrine
e. Holocrine - ✔✔a. Apocrine
Mutation in connexin26 (Cx26) underlie a range of serious human pathologies. More
recently, it was also reported that Cx26 hemichannels linked to keratitis-ichthyosis-
Katelyn Whitman, All Rights Reserved © 2025 2
, deafness syndrome, are associated with disordered breathing in humans. Mutation in
connexin26 most likely will disturb:
a. Tight junctions
b. Adhering junctions
c. Gap junctions
d. Desmosomes - ✔✔c. Gap junctions
Which of the following is TRUE?
a. Homeostatic mechanisms work through positive feedback
b. Homeostasis functions to ensure internal conditions fluctuate around a set-point
c. Circadian thythms affect set points
d. Both A and B is true
e. Both B and C is true - ✔✔e. Both B and C is true
How does PTH help increase the calcium ion concentration of the blood?
a. PTH decreases urine calcium output
b. PTH increases blood calcium levels by decreasing osteoclast activity
c. PTH increases blood calcium levels by increasing osteoblast activity
Katelyn Whitman, All Rights Reserved © 2025 3
QUESTIONS AND ANSWERS 100%
PASS
In the skull of a newborn baby, the space between the developing skull bones is known
as
a. Lacuna
b. Aversion canals
c. Fontanel
d. Intramembranous canal
e. Central canal - ✔✔c. Fontanel
You recently identified a disorder in which the activity of osteoblasts exceeds the
activity of osteoclasts. How will the properties of the long bone be affected?
a. The bone would have a reduced inorganic content; as a result it would be weaker and
more elastic.
Katelyn Whitman, All Rights Reserved © 2025 1
,b. The bone would have an increased inorganic content; as a result it would be weaker
and more elastic
c. The bone would have a reduced inorganic content; as a result it would be tougher
and less ductile.
d. The bone would have an increased inorganic content; as a result it would be tougher
and less ductile
e. The bone would have a reduced inorganic content; as a result it would sustain greater
compressive forces - ✔✔d. The bone would have an increased inorganic content; as a
result it would be tougher and less ductile
The method of mammary gland secretion is:
a. Apocrine
b. Mesocrine
c. Merocrine
d. Fullcrine
e. Holocrine - ✔✔a. Apocrine
Mutation in connexin26 (Cx26) underlie a range of serious human pathologies. More
recently, it was also reported that Cx26 hemichannels linked to keratitis-ichthyosis-
Katelyn Whitman, All Rights Reserved © 2025 2
, deafness syndrome, are associated with disordered breathing in humans. Mutation in
connexin26 most likely will disturb:
a. Tight junctions
b. Adhering junctions
c. Gap junctions
d. Desmosomes - ✔✔c. Gap junctions
Which of the following is TRUE?
a. Homeostatic mechanisms work through positive feedback
b. Homeostasis functions to ensure internal conditions fluctuate around a set-point
c. Circadian thythms affect set points
d. Both A and B is true
e. Both B and C is true - ✔✔e. Both B and C is true
How does PTH help increase the calcium ion concentration of the blood?
a. PTH decreases urine calcium output
b. PTH increases blood calcium levels by decreasing osteoclast activity
c. PTH increases blood calcium levels by increasing osteoblast activity
Katelyn Whitman, All Rights Reserved © 2025 3
