NBCE PART 1 PHYSIOLOGY EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY GRADED A+ 2025 – 2026

NBCE PART 1 PHYSIOLOGY EXAM WITH CORRECT ACTUAL QUESTIONS
AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY GRADED
A+ 2025 – 2026




What percentage of blood flow needs atrial contraction or P wave AV? - CORRECT ANSWER-20%



What are the name of the atrioventricular (AV) nodes and their perspective sides? - CORRECT
ANSWER-Tricuspid: Right

Mitral/Bicuspid: Left



What is isovolumetric contraction? - CORRECT ANSWER-End of diastole around 120ml causing
tricuspid or mitral valve to close



How many pulmonary arteries are there vs veins? - CORRECT ANSWER-- 2 pulmonary arteries

- 4 pulmonary veins



What two arteries in the body carry deoxygenated blood? - CORRECT ANSWER-- Pulmonary
arteries

- Umbilical arteries

What structure does upper extremity drain into? - CORRECT ANSWER-Superior vena cava (SVC)



What structure does lower extremity drain into? - CORRECT ANSWER-Inferior vena cava (IVC)

,What drains the lumbars into the SVC? - CORRECT ANSWER-azygous vein



Which side of the body is the azygous vein located? - CORRECT ANSWER-- Right side

- Hemiazygos will be on the left which drains to azygous to svc



What percentage of blood flows into the ventricles passively? - CORRECT ANSWER-80%




What vessels are blown open during mid-systole? - CORRECT ANSWER-pulmonic or aortic
semilunar valves



What two veins carry oxygenated blood? - CORRECT ANSWER-- Pulmonary veins

- Umbilical vein



What does the Bohr effect do? - CORRECT ANSWER-Binds 4 oxygen molecules to form
hemoglobin



What is the pathway of blood through the heart? - CORRECT ANSWER-The pathway of blood
through the heart is:

- superior vena cava,

- right atrium,

- tricuspid valve,

- right ventricle,

- lungs for oxygenation,

- pulmonary valve,

- left atrium,

,- bicuspid valve,

- left ventricle,

- aortic valve,

- aorta.



Does depolarization happen before or after contraction? - CORRECT ANSWER-Before



Where is the SA node (sinoatrial) located? - CORRECT ANSWER-Right atrium



Do both atrium contract from SA node? - CORRECT ANSWER-True



What is P wave? - CORRECT ANSWER-- atrial depolarization

- SA node in the crista terminalis of the right atrium



What is the average bpm for the SA node? - CORRECT ANSWER-45 Bpm



What is P-R interval? - CORRECT ANSWER-AV nodal delay



What is R? - CORRECT ANSWER-isovolumetric contraction



Where do you find intercalated discs and gap junctions? - CORRECT ANSWER-- Cardiac muscle
or hear muscles



What are intercalated discs do? - CORRECT ANSWER-speed up communication between atrium
and ventricles

, What is the fastest system in the heart? - CORRECT ANSWER-Purkinje system



What is the QRS complex? - CORRECT ANSWER-- ventricular depolarization



Where is atrial repolarization hidden? - CORRECT ANSWER-Under QRS complex



What happens during the T wave? - CORRECT ANSWER-ventricular repolarization



What is the S-T segment? - CORRECT ANSWER-isovolumetric repolarization



What pathology is associated with an inverted T wave or altered S-T segment? - CORRECT
ANSWER-Myocardial infarction/heart attack



What is prevention mechanism against tetany? - CORRECT ANSWER-- Slow calcium channel

- Absolute refractory period

- Plateau

- Happens in cardiac muscle



What is the difference between sympathetic vs parasympathetic reactions for the heart or
cardiac muscle? - CORRECT ANSWER-Sympathetic: speed up heart and dilate eyes (seeing
danger)



Parasympathetic: slow down heart rate and constrict eyes (Rest and relax)



When is diastole what heart murmurs are associated? - CORRECT ANSWER-- Aortic
Regurgitation

- Mitral Stenosis