If the position of a body is not changing with respect to a given frame of reference, the body is said to be at rest, motionless, immobile, stationary, or to have constant (time-invariant) position. An object's motion cannot change unless it is acted upon by a force, as described.
Giardia in Humans. Giardia is a microscopic parasite responsible for the diarrhea-related illness giardiasis. Also known as Giardia intestinalis or Giardia lamblia, this organism begins to multiply within the intestines after a person becomes infected.For more details on symptoms of giardiasis, treatment options, and different ways in which humans can become infected with this parasite, click Giardia.).
1 Giardiasis is the name of the disease caused by Giardia lamblia parasites that infect the small bowel. 2  Giardiasis is caused by Giardialamblia parasites that damage the small intestine; Giardia lamblia forms cysts are transmitted to humans in contaminated water or food and by person-to-person contact. Giardiasis is the name of the disease caused by Giardia lamblia parasites that infect the small bowel. 2  Giardiasis is caused by Giardialamblia parasites that damage the small intestine; Giardia lamblia forms cysts are transmitted to humans in contaminated water or food and by person-to-person contact.