Answer:
A. The atria are contracting and pushing blood into the bottom ventricles of the heart.
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Answer: B
Explanation: Aphthous ulcers are white, round, or oval lesions surrounded by a red halo that appear on the buccal mucosa.
Like all types of dementia, Alzheimer's is caused by brain cell death. It is a neurodegenerative disease, which means there is progressive brain cell death that happens over a course of time. The total brain size shrinks with Alzheimer's - the tissue has progressively fewer nerve cells and connections.