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Biology ­ The heart and how caffeine affects it

LO: to revise the cardiac cycle
To explain how caffeine affects the heart rate

Cardiac Cycle

Heart Relaxed ­ Atrio Ventricular Valves are open.
Deoxygenated blood flows from the vena cava into the right atrium. Oxygenated Blood from the pulmonary

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· Processes:
· Interphase ­ The cell in engaged in metabolic activity and performing its prepare for mitosis.
· Prophase The chromatin in the nucleus begins to condense and become visable in the light
microscope as chromosomes.
· Prophase The nucleolus disappears
· Prophase centrioles begin moving to opposite end…


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