|
|
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.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
![A William Jennings Bryan poster alludes to religion: “no crown of thorns” and no “cross of gold.” Br](https://biology-forums.com/gallery/47/medium_376716_26_08_15_11_16_36_2244824.jpeg)
![The legacy of Confucian thought continued for centuries in the form of civil service examinations ...](https://biology-forums.com/gallery/47/medium_660366_21_03_17_2_37_00_273051798.jpeg)