BRAINCAKEThe Heart
Revision notes for The Heart in Edexcel Biology (8BI0). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- Structure of the Human HeartThe human heart is a muscular pump made of cardiac muscle.
- Blood Flow through the HeartMammals have a double circulation: blood passes through the heart twice in each complete circuit of the body.
- Contraction of Cardiac MuscleThe walls of the heart are made of cardiac muscle, a type of muscle found only in the heart.
- The Cardiac CycleThe cardiac cycle is the sequence of events in one complete heartbeat.
- Control of the HeartbeatCardiac muscle is myogenic, but the heartbeat still needs to be coordinated so that the atria contract before the ventricles.
- ElectrocardiogramsAn electrocardiogram (ECG) is a recording of the electrical activity of the heart.
- Electrical and Pressure Changes in the HeartThe electrical changes shown on an ECG cause the contractions of the heart, so they can be matched to the pressure changes in the chambers and…