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Exam (elaborations)

Irene Gold Physiology Exam Questions And Accurate Answers

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Irene Gold Physiology Exam Questions And Accurate Answers ...

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  • September 17, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Irene Gold Physiology
  • Irene Gold Physiology
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Easton
Irene Gold Physiology Exam Questions And Accurate
Answers 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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