The Human Gas Exchange System Gas exchange takes place in the human thorax. This is a collection of organs and tissues in the chest cavity The main structures of the human gas exchange system Thora...
Heart Action: Initiation & Control Control of the basic heartbeat is?myogenic, which means the heart will beat without any external stimulus This intrinsic rhythm means the heart beats at aroun...
The Cardiac Cycle The contraction of the heart is called?systole, while the relaxation of the heart is called?diastole Atrial systole is the period when the atria are contracting and ventricular sy...
The Walls of the Heart The muscular walls of the atria are thinner than those of the ventricles When the atria contract, the thin muscular walls do not generate much pressure, but enough to force b...
Mammalian Heart Structure Heart structure The human heart has a mass of around 300g and is roughly the size of a closed fist The heart is a hollow, muscular organ located in the chest cavity It is ...
The Bohr Shift Changes in the oxygen dissociation curve?as a result of carbon dioxide levels?are known as the?Bohr effect, or?Bohr shift When the?partial pressure?of carbon dioxide in the blood is ...
The Oxygen Dissociation Curve The oxygen dissociation curve shows the?rate at which oxygen associates, and also dissociates, with haemoglobin?at different?partial pressures of?oxygen (pO2) Partial ...
Plasma & Carbon Dioxide Waste carbon dioxide produced during?respiration?diffuses from the tissues into the blood This waste carbon dioxide is transported around the body in different ways In t...
The Chloride Shift The chloride shift is the?movement of chloride ions into red blood cells?that occurs when?hydrogen carbonate ions are formed Hydrogen carbobate ions are formed by the following p...
