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	OCR Biology A level - Initiation of the heartbeat (KEB Biology) View
	AS Biology - Control of heart contractions (OCR A Chapter 8.5) (BioRach) View
	Control of heart rate: Role of SAN u0026 AVN in the cardiac cycle, Parasympathetic u0026 sympathetic nerves (Miss Estruch) View
	A Level Biology Revision (Freesciencelessons) View
	A Level Biology Revision (Year 13) (Freesciencelessons) View
	AS Biology - Cardiac cycle (OCR A Chapter 8.5) (BioRach) View
	The Cardiac Cycle is SO EASY! Stop Making it Hard! (Interactive Biology) View
	8-17 Controlling the heartbeat (Cambridge AS u0026 A Level Biology, 9700) (OtterBioTutor) View
	A-level- CARDIAC CYCLE. Diastole, atrial systole, ventricular systoles +the pressure +volume changes (Miss Estruch) View
	A Level Biology Revision (Freesciencelessons) View