Deoxygenated blood returns to the heart, where it enters the right atrium through the <span>superior and inferior vena cava. It then goes to the right ventricle through the tricuspid valve, after which it is pumped to the pulmonary artery through the pulmonary valve. The pulmonary valve splits in two and is connected to the lungs, where the blood is pushed through capillaries in the lungs and is oxygenated and drops CO2. It then goes into the pulmonary vein and goes into the left atrium of the heart, after which it enters the left atrium, then goes through the mitral valve to the left ventricle, where it is pumped into the aorta through the aortic valve and distributed throughout the body, becoming deoxygenated and completing the cycle.</span>
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Sickle cell anemia results from a mutation in a gene called HBB, which contains the blueprint for cells to make part of a protein called hemoglobin. The hemoglobin protein is made up of two alpha chains and two beta chains.
Sickle cell anemia is the result of a point mutation, a change in just one nucleotide in the gene for hemoglobin. This mutation causes the hemoglobin in red blood cells to distort to a sickle shape when deoxygenated. The sickle-shaped blood cells clog in the capillaries, cutting off circulation.
Answer:
Antibodies
Explanation:
Specific immune responses are triggered by 'antigens'. Antigens are found on the surface of a pathogen and is used to identify a specific pathogen. Antigens trigger the immune system to release cells that attach themselves to Antigens in order to kill off pathogens. These cells attack Pathogens using <em>antibodies</em>
