Supply and demand. The coronary arteries regulate the supply of blood to your heart muscle depending on how much oxygen your heart needs at the time, as indicated by: The number of times your heart beats per minute (heart rate). Your blood pressure. The force of your heart's contractions.
The pinworm is the most common roundworm in the United States. It is small and threadlike and infests many more children than adults. The ascaris roundworm thrives in the intestinal tract of mammals and can range in length from six to thirteen inches.
Of the many parasitic infestations involving worms, pinworms are the most prevalent form of worm infestation. They affect approximately 200 million people all over the world, one-third of which can be found in the United States. Genus Enterobius or pinworm, is a parasitic roundworm belonging to the phylum Nematoda.