Statistics for Edexcel GCSE Biology Unit 8

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This quiz has been taken 48 times
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Answer Stats

Hint	Answer	% Correct
Blood vessels that carry blood away from the heart. They have thick walls with elastic and muscle fibres and a narrow lumen as blood flows under high pressure.	Arteries	88%
The net movement of particles from an area of high concentration to an area of low concentration.	Diffusion	88%
Blood vessels with one cell thick walls, allowing faster diffusion of substances into and out of the vessels.	Capillaries	85%
Blood vessels that carry blood towards the heart. They have thin walls and a wide lumen as blood flows under low pressure. Also contain valves to prevent backflow of blood.	Veins	85%
Straw-coloured liquid component of blood which carries dissolved substances such as glucose, carbon dioxide and urea.	Plasma	83%
Artery that carries oxygenated blood to the rest of the body from the left ventricle.	Aorta	75%
Protein found in red blood cells which binds with oxygen in the lungs and releases it in the tissues.	Haemoglobin	73%
Type of white blood cell that produces antibodies which bind to foreign cells in order to destroy them.	Lymphocytes	70%
Cell fragments that have no nuclei. They produce substances needed to clot blood at the site of an injury.	Platelets	70%
Vein that brings deoxygenated blood from the rest of the body.	Vena Cava	70%
Artery that carries deoxygenated blood from the right ventricle to the lungs.	Pulmonary artery	68%
Vein that carries oxygenated blood from the lungs to the left atrium.	Pulmonary vein	68%
Small pockets in which gases are exchanged between the air and the blood.	Alveoli	65%
Type of white blood cell that surrounds and engulfs foreign cells (due to their flexible cell membranes) to digest them with enzymes.	Phagocytes	65%
Glucose + oxygen --> carbon dioxide + water	Aerobic respiration	63%
Flaps of tissue in the veins and heart to prevent backflow of blood.	Valves	60%
The difference in concentration of a chemical across a membrane.	Concentration gradient	50%
All the chemical reactions that occur in the body.	Metabolism	38%
Wall of tissue separating the two sides of the heart.	Septum	33%
Stroke volume x heart rate = ?	Cardiac output	18%
Red blood cells. They have a biconcave shape to increase the SA:V for maximum diffusion rate, and no nucleus to maximise space for (answer below).	Erythrocytes	10%
Stop valves from turning inside out.	Tendons	8%
A series of exothermic chemical reactions, catalysed by enzymes, that release energy from substances such as glucose or fat which occur continuously in living cells to release energy for metabolic processes.	Cellular respiration	5%
Glucose -> lactic acid	Anaerobic respiration (in humans)	3%