The purpose of the retina is to get the light that the lens focuses on to convert light into neuronal signals and send these signals to the brain for visual recognition.

Coffee helps us stay awake as it binds to receptors for adenosine in our brain. Instead of slowing down because of the adenosine’s effect, the nerve cells speed up.

What makes it strong is either because of its animal inhabitance or due to specific mutations in a member of the human Coronaviruses. According to recent evidence, bats are likely to be the source of initial contact (as the genome of Coronavirus that hosts them, resembles by 94% that of the COVID 19. Pangolins suspected to be the possible intermediate host. However, according to many researchers, the COVID-19 virus structure seems so complicated that it is highly unlikely to be natural, and it is possible that is laboratory-made and accidentally released.

The normal range for one-day urine output is 800-2000 milliliters a day (with a normal fluid intake of about 2 liters per day). The examples above are general measurements for the results of these tests.

Athletic heart syndrome (AHS) is a non-pathological condition in which the human heart is enlarged as a consequence of repetitive cardiac loading, and the resting heart rate is lower than normal.

Surgical mask sare worn by doctors and dentists to help protect other people and the environment from the mask-wearer by trapping respiratory droplets. In case of COVID 19 the purpose of such masks, according to CDC, is to be used from those who are already ill to avoid spreading the virus around. Surgical masks are not the same as N95 respirators. N95 respirators are special tightly fitting masks that filter out viruses and bacteria. Health workers use N95 respirators at risk of inhaling infectious and other harmful particles, need to be professionally fitted and are not recommended by the CDC for members of the public.

The tendon (or tendons) are a strong band of fibrous connective tissue, which usually connects the muscles with the bone and can withstand tension. The tendons are similar to ligaments, except that the ligaments attach one bone to the other.

The pH test looks at how much acid or alkali is human urine. According to the American Association of Clinical Chemistry, the average urine pH value is 6.0 but may range from 4.5 to 8.0. Urine below 5.0 is acidic, and urine more than 8.0 – alkaline or basic.

Compared to mineral water and to whatever surface it comes in contact, distilled water tries to pull minerals to maintain a balance.

Mary Mallon had worked in many domestic positions for affluent families before becoming a cook. She was a healthy carrier of Salmonella typhi who spread the disease, as many were infected due to her refusal of being ill. At least three deaths were attributed to her, but the exact number is not known, but it is estimated that she may have caused more than 50 fatalities. She was arrested and quarantined in 1907 and spent the last 24 years and seven months of her life in medical isolation at Riverside Hospital on North Brother Island.