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.
Pinworms (Enterobius vermicularis) are the most common intestinal parasite in the U.S. Pinworms occur most often in school-age children, but are highly contagious, and can easily spread to the entire family and to classmates of infected children.dult pinworms live in the large intestine; males and females are about 5 mm and 10 mm long, respectively. After copulation the males die. When the female is ready to lay eggs she crawls out of the anus and deposits the eggs on the perianal skin; a single female can produce more than 10,000 eggs.