The blood does not move around the body in blood vessels but it bathes the tissues directly while held in a cavity called the haemocoel.
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Closed Circulatory System
The blood moves in blood vessels.
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Single Circulation
The blood moves through the heart once in its passage around the body.
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Double Circulation
The blood passes through the heart twice in its circuit around the body.
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Pulmonary Circulation
This circulation serves the lungs - the right side of the heart pumps deoxygenated blood to the lungs. Oxygenated blood returns from the lungs to the left side of the heart.
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Systemic Circulation
This circulation serves the body tissues - the left side of the heart pumps oxygenated blood to the tissues. Deoxygenated blood from the body returns to the right side of the heart.
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Myogenic Contraction
The heartbeat is initiated within the muscle cells themselves, and not dependent on nervous or hormonal stimulation.
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Sino - Atrial Node
An area of the heart muscle in the right atrium that initiates a wave of electrical excitation across the atria.
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Atrio - Ventricular Node
The only conducting area of tissue in the wall of the heart between the atria and ventricles, through which electrical excitation passes from the atria to conducting tissue in the walls of the ventricles.
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Affinity
The degree to which two molecules are attracted to each other.
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Cooperative Binding
The increasing ease with which haemoglobin binds its second and third oxygen molecules, as the conformation of the haemoglobin molecule changes.
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Bohr Effect
The movement of the oxygen dissociation curve to the right at a higher partial pressure of carbon dioxide, because at a given oxygen partial pressure, haemoglobin has a lower affinity for oxygen.
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Chloride Shift
The diffusion of chloride ions from the plasma into the red blood cell, preserving electrical neutrality.
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Other cards in this set
Card 2
Front
The blood moves in blood vessels.
Back
Closed Circulatory System
Card 3
Front
The blood moves through the heart once in its passage around the body.
Back
Card 4
Front
The blood passes through the heart twice in its circuit around the body.
Back
Card 5
Front
This circulation serves the lungs - the right side of the heart pumps deoxygenated blood to the lungs. Oxygenated blood returns from the lungs to the left side of the heart.
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