OCR Biology 3.2 Key Definitions

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  • Created by: milly._98
  • Created on: 25-04-16 12:21
Transport
The movement of substances such as oxygen, nutrients, hormones, waste and heat around the body
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Arteries
Small blood vessels that distribute blood from an artery to the capillaries
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Capillaries
Very small vessels with very thin walls
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Closed Circulatory System
Where the blood is held in vessels
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Open Circulatory System
Where the blood is not held in vessels
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Veins
Vessels that carry the blood back to the heart
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Venules
Small blood vessels that collect blood from capillaries and lead into the veins.
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Hydrostatic Pressure
The pressure that a fluid exerts when pushing agains the sides of a vessel or container
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Lymph
The fluid held in the lymphatic system
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Oncotic Pressure
The pressure created by the osmotic effects of the solutes
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Plasma
The fluid portion of the blood
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Tissue Fluid
The fluid surrounding the cells and tissues
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Atrio-Ventricular Valves
Valves between thee atria and the ventricles, which ensures that blood flows in the correct direction
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Cardiac Muscle
Specialised muscle found in the walls of the heart chambers
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Semilunar Valves
Valves that prevent blood from re-entering the heart from the arteries
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Cardiac Cycle
The sequence of events in one full beat of the heart
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Bradycardia
A slow heart rhythm
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Ectopic Heartbeat
An extra beat or an early beat of the ventricles
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Electrocardiogram
A trace that records the electrical activity of the heart
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Fibrillation
Uncoordinated contraction of the atria and ventricles
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Myogenic Muscle
Muscle that can initiate its own contrction
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Purkyne Tissue
Consistes of specially adapted muscle fibres that conduct the wave of excitation from the AVN down the septum to the ventricles
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Sino-Atrial Node (SAN)
The hearts pacemaker. A small patch of tissue that sends out waves of electrical excitation at regular intervals in order to initiate contractions
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Tachycardia
A quick heart rhythm
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Dissociation
Releasing the oxygen from the oxyhaemoglobin
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Fetal Haemoglobin
The type of haemoglobin only found in the fetus.
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Carbonic Anhydrase
The enzyme that catalyses the combination of carbon dioxide and water
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Chloride Shift
The movement of chloride ions into the erythrocytes to balance the charge as hydrocarbonate ions leave the cell
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Bohr Effect
The effect that extra carbon dioxide has on the haemoglobin. This explains the release of more oxygen
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Haemoglobinic Acid
The compound formed by the buffering action of haemoglobin as it combines with excess hydrogen ions.
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Other cards in this set

Card 2

Front

Small blood vessels that distribute blood from an artery to the capillaries

Back

Arteries

Card 3

Front

Very small vessels with very thin walls

Back

Preview of the back of card 3

Card 4

Front

Where the blood is held in vessels

Back

Preview of the back of card 4

Card 5

Front

Where the blood is not held in vessels

Back

Preview of the back of card 5
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