An exposure pathway-describes a unique mechanism by which an. individual or population is exposed to chemical or physical agents at or originating from. a site. Each exposure pathway includes a source or release from a source, an exposure. point, and an exposure route.
Terminology: Young cattle are called calves. A young male is called a bull calf; a young female before she has calved the second time is called a heifer (pronounced heffer). A young female that has had only one calf is sometimes called a first-calf heifer..
The body region commonly referred to as the calf is in the back of the leg, just below the knee. The calf is made of three major muscles. These muscles are the two gastrocnemius muscles (medial and lateral), and the soleus muscle. Another smaller muscle called the plantaris muscle, is also in the calf. There are two bones in the calf region, the larger tibia and the smaller fibula.