NBCE PART 1 PHYSIOLOGY FINAL EXAM
SCRIPT 2026 LATEST ACTUAL QUESTIONS
AND WELL EXPLAINED ANSWERS
GRADED A+
⩥ Blood from Lower Extremity goes into the heart from the ______.
Answer: Inferior Vena Cava
⩥ Where does the Azygous vein drain into the heart from? Answer:
Lumbars into SVC
⩥ ____ % of blood passively flows into the right ventricle. Answer: 80
⩥ ____ % needs atrial contraction. Answer: 20
⩥ P-wave starts at ___ node in Crista Terminals of right atrium. Answer:
SA
⩥ Tricuspid closes after __ - wave. Answer: P
⩥ Impulse travels to ____ node. Answer: AV
,⩥ What is AV-Nodal Delay? Answer: SA node impulse to AV node and
delayed (P-R interval)
⩥ What is isovolumetric contraction? Answer: Tricuspid closes -->
ventricle contracts
⩥ QRS complex occurs due to ______. Answer: Ventricular
depolarization
⩥ Mid-systole causes enough pressure to blow open ____ ____ valves.
Answer: pulmonic semilunar
⩥ Blood exits the heart via pulmonary ____ to the lungs. Answer: artery
⩥ The pulmonary artery carries ________ blood. Answer: deoxygenated
⩥ What are the two arteries that carry deoxygenated blood? Answer: 1.
Pulmonary artery
2. Umbilical artery (in fetus)
⩥ Blood is oxygenated via ____ _____. Answer: Bohr effect
⩥ How many O2 molecules are in hemoglobin? Answer: 4
,⩥ In the lungs, ____ % hemoglobin is saturated with O2. Answer: 97
⩥ In the lungs the Bohr effect causes ____ CO2, ____ H+, ____ DPG,
and ____ temp. (increase or decrease) Answer: decreased for all 4
⩥ Blood exits lung via pulmonary ____ into the left atrium. Answer:
vein
⩥ What are the two veins that carry oxygenated blood? Answer: 1.
Pulmonary vein
2. Umbilical vein (in fetus)
⩥ In the atrium, ____ % of blood passively flows into the left ventricle
Answer: 80
⩥ In the atrium the other 20% of blood flows into the left ventricle by
______. Answer: P-wave
⩥ How does blood flow through the left ventricle? Answer: Mitral
closes --> isovolumetric contraction --> builds tension --> mid systole --
> aortic valves open --> blood rushes into aorta
⩥ The umbilical vein becomes _________. Answer: ligamentum teres
, ⩥ The ligamentous teres separates the ____ lobe from _____ lobe of the
liver. Answer: left; quadrate
⩥ Diastole ______. (contracts or relaxes) Answer: relaxes
⩥ Systole _____. (contracts or relaxes) Answer: contracts
⩥ In an EKG the p-wave = atrial _____. Answer: depolarization
⩥ In an EKG the P-R interval = Answer: isovolumetric contract
⩥ P-R interval is released from ____ node down the _____ into _____.
Answer: AV; bundle of His; purkinje fibers
⩥ Moderator band = ______ Answer: right bundle of His in
septomarginal recess of right ventricle
⩥ What system is 400x faster than other neurons in the heart? Why?
Answer: Purkinje system; due to intercalated discs and gap junctions
⩥ QRS = ______ Answer: ventricular depolarization
SCRIPT 2026 LATEST ACTUAL QUESTIONS
AND WELL EXPLAINED ANSWERS
GRADED A+
⩥ Blood from Lower Extremity goes into the heart from the ______.
Answer: Inferior Vena Cava
⩥ Where does the Azygous vein drain into the heart from? Answer:
Lumbars into SVC
⩥ ____ % of blood passively flows into the right ventricle. Answer: 80
⩥ ____ % needs atrial contraction. Answer: 20
⩥ P-wave starts at ___ node in Crista Terminals of right atrium. Answer:
SA
⩥ Tricuspid closes after __ - wave. Answer: P
⩥ Impulse travels to ____ node. Answer: AV
,⩥ What is AV-Nodal Delay? Answer: SA node impulse to AV node and
delayed (P-R interval)
⩥ What is isovolumetric contraction? Answer: Tricuspid closes -->
ventricle contracts
⩥ QRS complex occurs due to ______. Answer: Ventricular
depolarization
⩥ Mid-systole causes enough pressure to blow open ____ ____ valves.
Answer: pulmonic semilunar
⩥ Blood exits the heart via pulmonary ____ to the lungs. Answer: artery
⩥ The pulmonary artery carries ________ blood. Answer: deoxygenated
⩥ What are the two arteries that carry deoxygenated blood? Answer: 1.
Pulmonary artery
2. Umbilical artery (in fetus)
⩥ Blood is oxygenated via ____ _____. Answer: Bohr effect
⩥ How many O2 molecules are in hemoglobin? Answer: 4
,⩥ In the lungs, ____ % hemoglobin is saturated with O2. Answer: 97
⩥ In the lungs the Bohr effect causes ____ CO2, ____ H+, ____ DPG,
and ____ temp. (increase or decrease) Answer: decreased for all 4
⩥ Blood exits lung via pulmonary ____ into the left atrium. Answer:
vein
⩥ What are the two veins that carry oxygenated blood? Answer: 1.
Pulmonary vein
2. Umbilical vein (in fetus)
⩥ In the atrium, ____ % of blood passively flows into the left ventricle
Answer: 80
⩥ In the atrium the other 20% of blood flows into the left ventricle by
______. Answer: P-wave
⩥ How does blood flow through the left ventricle? Answer: Mitral
closes --> isovolumetric contraction --> builds tension --> mid systole --
> aortic valves open --> blood rushes into aorta
⩥ The umbilical vein becomes _________. Answer: ligamentum teres
, ⩥ The ligamentous teres separates the ____ lobe from _____ lobe of the
liver. Answer: left; quadrate
⩥ Diastole ______. (contracts or relaxes) Answer: relaxes
⩥ Systole _____. (contracts or relaxes) Answer: contracts
⩥ In an EKG the p-wave = atrial _____. Answer: depolarization
⩥ In an EKG the P-R interval = Answer: isovolumetric contract
⩥ P-R interval is released from ____ node down the _____ into _____.
Answer: AV; bundle of His; purkinje fibers
⩥ Moderator band = ______ Answer: right bundle of His in
septomarginal recess of right ventricle
⩥ What system is 400x faster than other neurons in the heart? Why?
Answer: Purkinje system; due to intercalated discs and gap junctions
⩥ QRS = ______ Answer: ventricular depolarization
