How do nerves from the medulla influence heart rate?
How do nerves from the medulla influence heart rate?
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Questions and Answers
How does the electrical signal from the SA node stimulate contraction in the heart chambers?
How does the electrical signal from the SA node stimulate contraction in the heart chambers?
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How does the SA node function as the heart’s pacemaker?
How does the SA node function as the heart’s pacemaker?
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What is the role of the sinoatrial (SA) node in initiating the heartbeat?
What is the role of the sinoatrial (SA) node in initiating the heartbeat?
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Why is there a separate circulatory system for the lungs?
Why is there a separate circulatory system for the lungs?
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How do veins collect and return blood to the atria at low pressure?
How do veins collect and return blood to the atria at low pressure?
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What role do valves play in veins and the heart, and how do they prevent backflow?
What role do valves play in veins and the heart, and how do they prevent backflow?
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Why are capillaries suited for material exchange between blood and tissues?
Why are capillaries suited for material exchange between blood and tissues?
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How do muscle and elastic fibers in arteries help maintain blood pressure between heartbeats?
How do muscle and elastic fibers in arteries help maintain blood pressure between heartbeats?
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What is the function of muscle cells and elastic fibers in the walls of arteries?
What is the function of muscle cells and elastic fibers in the walls of arteries?
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Total Questions 2747
Top Questions
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Discuss the advantages and disadvantages of genetically modifying crops, including soya, maize and rice
Sourav
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Outline the process of genetic modification using bacterial production of a human protein as an example, limited to: (a) isolation of the DNA making up a human gene using restriction enzymes, forming sticky ends (b) cutting of bacterial plasmid DNA with the same restriction enzymes, forming complementary sticky ends (c) insertion of human DNA into bacterial plasmid DNA using DNA ligase to form a recombinant plasmid (d) insertion of recombinant plasmids into bacteria (specific details are not required) (e) multiplication of bacteria containing recombinant plasmids (f) expression in bacteria of the human gene to make the human protein
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Outline examples of genetic modification: (a) the insertion of human genes into bacteria to produce human proteins (b) the insertion of genes into crop plants to confer resistance to herbicides (c) the insertion of genes into crop plants to confer resistance to insect pests (d) the insertion of genes into crop plants to improve nutritional qualities
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Describe genetic modification as changing the genetic material of an organism by removing, changing or inserting individual genes
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Describe and explain the conditions that need to be controlled in a fermenter, including: temperature, pH, oxygen, nutrient supply and waste products
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Describe how fermenters can be used for the large-scale production of useful products by bacteria and fungi, including insulin, penicillin and mycoprotein