D. Pathogen. :) I hope it right :)
Answer and Explanation:
Alzheimer's disease (AD) is a neurodegenerative disease probably caused by the accumulation of beta-amyloid peptide in the brain. AD is the leading cause of dementia in the elderly people. Usually presents with gradual symptoms of loss of cognitive functions (memory, orientation, attention and language) caused by the death of neurons.
Similar to AD, we have Lewy body dementia and Parkinson's disease dementia, which may be variations of the same disease. In this disease, synuclein (a protein in the brain that helps nerve cells to communicate) changes shape (remains "badly folded") and slowly accumulates mainly in the brain, but also in the digestive tract and heart. These abnormal synuclein deposits are called Lewy bodies. Misfolded synuclein in Lewy bodies triggers more misfolded synuclein, resulting in the formation of more Lewy bodies. Brain damage results from the accumulation of Lewy bodies. Lewy bodies also is develop in some people with Alzheimer's disease,
Option B is the correct answer.
Increased cardiorespiratory fitness
means the body makes more efficient use of oxygen requiring less to
function as well or better than when you are less fit as judged on this
index.
He must find his average heart rate zone
To be heathlyer and have more variety
