1|Page
NBEO PART 1 EXAM LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Which of the following antibodies is the first to be secreted during
an immune response?
IgG antibodies
IgE antibodies
IgD antibodies
IgA antibodies
IgM antibodies - ANSWER-IgE antibodies are involved in allergic
reactions as well as inflammatory responses.
IgM is the antibody responsible for activation of the
complement pathway and is the first antibody produced in
response to an infection.
IgA antibodies are known as the secretory antibodies and are
located in mucous membranes. They are primarily
responsible for protection of the lungs and gastrointestinal
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tract from infection. IgA antibodies can also be detected in
some mammalian milk transferred for passive immunity.
IgD antibodies are typically bound to the surfaces of B-
lymphocytes and are only a minor blood component.
IgG antibodies are responsible for long-term protection (i.e.,
from viruses) and is the predominant antibody type found in
blood. IgG is the only type of immunoglobulin that can cross
the placenta to help protect the fetus. IgG is also found in
milk produced early after the delivery of a child.
Which of the following walls of the orbit is MOST susceptible to a
blowout fracture secondary to blunt ocular trauma?
Lateral wall
Medial wall
Floor
Roof - ANSWER-All of the walls of the orbit are relatively thin,
making them susceptible to injury and fracture when blunt force
trauma to the eye is incurred. Increased pressure in the orbit often
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results in one or more areas of the orbit to break and "blow out"
into the sinuses. The inferior and medial walls tend to be the most
susceptible to this type of injury, although an orbital floor fracture
is the most common. In certain patients, a blowout fracture of the
floor will require surgical repair. These circumstances include
cases in which there is rectus muscle entrapment, enophthalmus
greater than 2mm, and large fractures that include over 50% of
the involved wall (this is typically decided after a 2-week waiting
period).
Which of the primary germ layers of embryonic development take
part in the development of ocular structures?
Ectoderm only
Endoderm only
Mesoderm and ectoderm
Mesoderm and endoderm
Ectoderm and endoderm - ANSWER-The three primary germ
layers are the endoderm, mesoderm, and ectoderm. Of these
layers, only the ectoderm and mesoderm are involved in ocular
development. The endoderm is involved in development of the
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gastrointestinal tract, respiratory tract, endocrine organs, urinary
bladder, and auditory epithelium.
Ref: Remington, LA. Clinical Anatomy of the Visual System, 1998
pp 103
Which two layers of the iris are derived from mesoderm?
The anterior limiting layer and the stroma
The epithelium and the posterior pigmented epithelium
The stroma and the anterior epithelium
The posterior pigmented epithelium and the anterior limiting layer
The stroma and the posterior pigmented epithelium - ANSWER-
The iris can be classified into four layers. The most external is the
anterior limiting layer, followed by the stroma, the anterior
epithelium and the posterior pigmented epithelium which is the
most internal layer. The first two layers are derived from
mesoderm.
The anterior limiting layer contains numerous melanocytes
and fibroblasts. Interestingly, this layer is not present over
NBEO PART 1 EXAM LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Which of the following antibodies is the first to be secreted during
an immune response?
IgG antibodies
IgE antibodies
IgD antibodies
IgA antibodies
IgM antibodies - ANSWER-IgE antibodies are involved in allergic
reactions as well as inflammatory responses.
IgM is the antibody responsible for activation of the
complement pathway and is the first antibody produced in
response to an infection.
IgA antibodies are known as the secretory antibodies and are
located in mucous membranes. They are primarily
responsible for protection of the lungs and gastrointestinal
,2|Page
tract from infection. IgA antibodies can also be detected in
some mammalian milk transferred for passive immunity.
IgD antibodies are typically bound to the surfaces of B-
lymphocytes and are only a minor blood component.
IgG antibodies are responsible for long-term protection (i.e.,
from viruses) and is the predominant antibody type found in
blood. IgG is the only type of immunoglobulin that can cross
the placenta to help protect the fetus. IgG is also found in
milk produced early after the delivery of a child.
Which of the following walls of the orbit is MOST susceptible to a
blowout fracture secondary to blunt ocular trauma?
Lateral wall
Medial wall
Floor
Roof - ANSWER-All of the walls of the orbit are relatively thin,
making them susceptible to injury and fracture when blunt force
trauma to the eye is incurred. Increased pressure in the orbit often
,3|Page
results in one or more areas of the orbit to break and "blow out"
into the sinuses. The inferior and medial walls tend to be the most
susceptible to this type of injury, although an orbital floor fracture
is the most common. In certain patients, a blowout fracture of the
floor will require surgical repair. These circumstances include
cases in which there is rectus muscle entrapment, enophthalmus
greater than 2mm, and large fractures that include over 50% of
the involved wall (this is typically decided after a 2-week waiting
period).
Which of the primary germ layers of embryonic development take
part in the development of ocular structures?
Ectoderm only
Endoderm only
Mesoderm and ectoderm
Mesoderm and endoderm
Ectoderm and endoderm - ANSWER-The three primary germ
layers are the endoderm, mesoderm, and ectoderm. Of these
layers, only the ectoderm and mesoderm are involved in ocular
development. The endoderm is involved in development of the
, 4|Page
gastrointestinal tract, respiratory tract, endocrine organs, urinary
bladder, and auditory epithelium.
Ref: Remington, LA. Clinical Anatomy of the Visual System, 1998
pp 103
Which two layers of the iris are derived from mesoderm?
The anterior limiting layer and the stroma
The epithelium and the posterior pigmented epithelium
The stroma and the anterior epithelium
The posterior pigmented epithelium and the anterior limiting layer
The stroma and the posterior pigmented epithelium - ANSWER-
The iris can be classified into four layers. The most external is the
anterior limiting layer, followed by the stroma, the anterior
epithelium and the posterior pigmented epithelium which is the
most internal layer. The first two layers are derived from
mesoderm.
The anterior limiting layer contains numerous melanocytes
and fibroblasts. Interestingly, this layer is not present over
