|
|
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
![Aristolochic acid (AA), a component of birthwort,a plant used in herbal remedies since ancient times](https://biology-forums.com/gallery/47/medium_12359_10_04_12_12_20_40.jpeg)
![Cataract extraction. The procedure involves a surgical removal of a cataract lens and its replacemen](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_37_46_9400219.jpeg)