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Irene Gold Physiology Exam Questions And Accurate Answers
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Irene Gold Physiology Exam Questions And AccurateAnswers 2024-2025
Corrected Right atrium
80% blood passively flows into right ventricle
20% needs atrial contraction
P-wave starts at sino-atrial node in crista terminales
Impulse travels to AV node
AV-nodal delay
SA node impulse to AV node and delayed (P-R interval)
Right ventricle
Tricuspid closes and this ventricle contracts= Isovolumetric contraction
Ventricle DEPOLARIZATION= QRS complex
Pulmonary artery
In mid-systole, enough pressure builds up in the right ventricle to open pulmonic
semilunar valves
Blood exits via ____________________ into the lungs
These arteries carry DEOXYGENATED BLOOD
Umbilical artery in fetus
What is the only other artery that carry deoxygenated blood?
Lungs
Blood picks up oxygen in this organ
Four O2 molecules in hemoglobin
,97% hemoglobin is saturated with O2 (can never be higher)
Decreased CO2, Decrease H+, decrease DPG, decrease temperature
Pulmonary vein
Blood leaves lung via _________________________ to the left atrium
Carries OXYGENATED blood
Also found in the umbilical vein
Left Atrium
80% blood passes into left ventricle passively
Other 20% requires P-wave (depolarization of atrial wall)
Left ventricle
Mitral closes---> Isovolumetric contraction---> builds tension
Midsystole--> aortic valve opens---> blood rushes into aorta---> Circulation
P wave
Atrial depolarization
Atrium CONTRACTS
P-R interval
Isovolumetric contraction
Released from AV node down bundle of his into purkinje fibers
Moderator band
Right bundle of his in septomarginal recess of right ventricle
3
Purkinje system in ventricle
400x faster than other neurons in heart due to intercalated discs and LOTS gap
junctions
QRS
Ventricular depolarization
, ventricle contracts
Q- Wave
1st downward deflection
Atrial repolarization
Hidden under the QRS complex
Chordae tendinae & Papillary muscles
What prevents AV valves from blowing back from ventricular contraction
T- wave
Ventricular repolarization
NA+ outside, K+ inside
U- wave
Repolarization of the papillary muscles
S-T segment
isovolumetric relaxation
(NO BLOOD IN VENTRICLES)
Filling of atrium
Myocardial infarction
An inverted T wave or altered S-T segment is caused by?
Prevent heart tetany
What is the point of slow calcium channels also known as "Long absolute refractory
Period"/ Plateaus
Impossible for heart to fire again
Autorhythmicity
Automatic conductivity
Heart can beat on its own due to leaky sodium channels
Due to SA node 45 BPM_
ability of node cells to stimulate their own action potentials
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