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How does the heart muscle and heart valves maintain one way blood flow from the atrium to the aorta?
Atrium has higher pressure than ventricle; Atrioventricular valve opens; Ventricle has higher pressure than atrium; Atrioventricular valve closes;Ventricle has higher pressure than aorta; Semilunar valve opens; Higher pressure in aorta than ventricle
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How does a vaccine lead to a person developing immunity to a pathogen?
Vaccine contains attenuated pathogen; T-cells activate B-cells; B-cells divide by mitosis; B-cells produce antibodies; Memory cells produced; More antibodies produced in secondary immune response
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How does a vaccine lead to a person developing immunity to a pathogen?

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Vaccine contains attenuated pathogen; T-cells activate B-cells; B-cells divide by mitosis; B-cells produce antibodies; Memory cells produced; More antibodies produced in secondary immune response

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