AI Study Pack

cardiac cycle

BiologyCBSEClass 12

AI-generated cheatsheet with key concepts, formulas, and common mistakes — plus audio, MCQs, mind maps & more.

Cardiac Cycle Cheat Sheet

Key Definitions


  • Cardiac Cycle: The sequence of events in one complete heartbeat, including contraction and relaxation of the heart.

  • Systole: Phase of contraction of the heart muscles.

  • Diastole: Phase of relaxation of the heart muscles.

  • Stroke Volume (SV): Volume of blood pumped from the left ventricle per beat.

Important Concepts

Phases of the Cardiac Cycle


  • Atrial Systole: Atria contract, pushing blood into the ventricles.

  • Ventricular Systole: Ventricles contract, ejecting blood into the aorta and pulmonary artery.

  • Diastole: Heart muscle relaxes; chambers fill with blood.

Heart Sounds


  • "Lub": Closure of AV valves during ventricular systole.

  • "Dub": Closure of semilunar valves during ventricular diastole.

Key Formulas


CO = SV × HR
  • CO: Cardiac Output (liters/minute)

  • SV: Stroke Volume (milliliters)

  • HR: Heart Rate (beats/minute)

Common Mistakes to Avoid


Common Mistake: Confusing systole and diastole phases.

Memory Tricks


Tip: "A Very Smart Dog" — Atrial Systole, Ventricular Systole, Diastole.

Key Diagrams



Atrial Systole
| |
V V
[Atria]-------> [Ventricles]
| |
| |
[Ventricular Systole]
|
V
[Aorta] [Pulmonary Artery]
\ /
\ /
[Diastole]

This pack also includes

Audio Podcast
5-min summary
10 MCQs
Exam-pattern
Mind Map
Visual connections
Flashcards
Spaced repetition

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