CRNI Exam Study Prep QUESTIONS AND ANSWERS 2026
Heart - Correct Answer A hollow, muscular organ made of four chambers that functions as a
two-sided pump
Right side of heart - Correct Answer low-pressure system pumping venous or deoxygenated
blood to the lung
Left side of heart - Correct Answer high-pressure system pumping arterial or oxygenated blood
to systemic circulation
right atrium - Correct Answer Thin walled muscle that acts as a receiving chamber.
Superior vena cava - Correct Answer Drains systemic venous blood from the upper part of the
body and from the inferior vena cava
Inferior vena cava - Correct Answer Drains systemic blood from the lower extremities
right ventricle - Correct Answer Most anterior chamber of the heart, lying directly beneath the
sternum
During diastole - Correct Answer tricuspid and mitral vale open, blood in the atria flows into
relaxed ventricles
Systolic pressures of Right Ventricle - Correct Answer May be low because of pulmonary
resistance
, left atrium - Correct Answer Most posterior chamber of the heart
left atrium receives blood from - Correct Answer right/left pulmonary veins (from lungs)
Left atrium wall thickness - Correct Answer Slightly thicker than that of right atrium and exerts a
pressure of 5-10mm Hg with little breathing variation
Left ventricle - Correct Answer Lies posterior to and to the left of the right ventricle
Left ventricle wall thickness - Correct Answer 13-15cm, three times thicker than right ventricle
cardiac valves function - Correct Answer to ensure one-way forward blood flow
Atrioventricular valves - Correct Answer Valves located along the AV groove separating the atria
from the ventricles, prevent backflow into the atria when the ventricles are contracting.
tricuspid valve - Correct Answer A valve that is situated at the opening of the right atrium of the
heart into the right ventricle and that resembles the mitral valve in structure but consists of
three triangular membranous flaps.
Tricuspid valve leaflets - Correct Answer anterior, posterior, medial/septal
Anterior and posterior leaflets of tricuspid valve - Correct Answer associated with right ventricle
lateral wall function
septal leaflet of tricuspid valve - Correct Answer attached to portions of the interventricular
septum sitting in close proximity to the AV node
Heart - Correct Answer A hollow, muscular organ made of four chambers that functions as a
two-sided pump
Right side of heart - Correct Answer low-pressure system pumping venous or deoxygenated
blood to the lung
Left side of heart - Correct Answer high-pressure system pumping arterial or oxygenated blood
to systemic circulation
right atrium - Correct Answer Thin walled muscle that acts as a receiving chamber.
Superior vena cava - Correct Answer Drains systemic venous blood from the upper part of the
body and from the inferior vena cava
Inferior vena cava - Correct Answer Drains systemic blood from the lower extremities
right ventricle - Correct Answer Most anterior chamber of the heart, lying directly beneath the
sternum
During diastole - Correct Answer tricuspid and mitral vale open, blood in the atria flows into
relaxed ventricles
Systolic pressures of Right Ventricle - Correct Answer May be low because of pulmonary
resistance
, left atrium - Correct Answer Most posterior chamber of the heart
left atrium receives blood from - Correct Answer right/left pulmonary veins (from lungs)
Left atrium wall thickness - Correct Answer Slightly thicker than that of right atrium and exerts a
pressure of 5-10mm Hg with little breathing variation
Left ventricle - Correct Answer Lies posterior to and to the left of the right ventricle
Left ventricle wall thickness - Correct Answer 13-15cm, three times thicker than right ventricle
cardiac valves function - Correct Answer to ensure one-way forward blood flow
Atrioventricular valves - Correct Answer Valves located along the AV groove separating the atria
from the ventricles, prevent backflow into the atria when the ventricles are contracting.
tricuspid valve - Correct Answer A valve that is situated at the opening of the right atrium of the
heart into the right ventricle and that resembles the mitral valve in structure but consists of
three triangular membranous flaps.
Tricuspid valve leaflets - Correct Answer anterior, posterior, medial/septal
Anterior and posterior leaflets of tricuspid valve - Correct Answer associated with right ventricle
lateral wall function
septal leaflet of tricuspid valve - Correct Answer attached to portions of the interventricular
septum sitting in close proximity to the AV node
