Summary Lecture notes Unit 1 - Lifestyle, Transport, Genes and Health Salters-Nuffield AS/A level Biology Student Book 1 + ActiveBook
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Unit 1 - Lifestyle, Transport, Genes and Health
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PEARSON (PEARSON)
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Salters-Nuffield AS/A level Biology Student Book 1 ActiveBook
Within these documents, you'll find a treasure trove of knowledge meticulously organized to offer clarity and coherence. Explore the intricate relationship between lifestyle choices and their impact on gene expression, unravel the complexities of transport systems essential for the survival of livi...
Summary Salters-Nuffield AS/A level Biology Student Book 1 + ActiveBook - Unit 1 - Lifestyle, Transport, Genes and Health
Presentation/Notes on Cardiovascular disease (A-Level Edexcel)
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A/AS Level
PEARSON (PEARSON)
Biology 2008
Unit 1 - Lifestyle, Transport, Genes and Health
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the cardiac cycle
capillary
valve present along the vessel :(
wall consists of a single layer of cells :)
endothelial cells present :)
veins
valves present along the vessel :)
wall consist of single layer of cells :(
endothelial cells present :)
three phases of cardiac cycle
atrial systole
ventricular systole
cardiac diastole
atrial systole
blood returns to the heart under low pressure to
the atria..as the atria fills, pressure increases
against the atrioventricular valve until they are
pushed open and blood begins to leak into the
ventricles
atria walls contract forcing more blood into the
ventricles
ventricular systole
ventricular systole follows atrial systole
ventricles contract from the base upwards,
increasing the pressure in the ventricles
the increased pressure forces the semilunar
valves open and pushes blood up and out
through the aorta and pulmonary arteries
the pressure of blood against the
atrioventricular valves closes them
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