1 Have students keep a record of their heart rates for one week by taking their pulse a few times a day. 2  Note time of day and activity at the time. 3  The amount of time the heart takes to return to a normal at-rest rate after exercise is called recovery time. 4  This is a measure of the body's general fitness. Note time of day and activity at the time. 2  The amount of time the heart takes to return to a normal at-rest rate after exercise is called recovery time. 3  This is a measure of the body's general fitness.
shard. n. 1. A broken piece or fragment, as of pottery or glass.2. Zoology A tough scale or covering, such as the elytron of a beetle.hard. n. 1. A broken piece or fragment, as of pottery or glass.
Dorosoma is Greek for lance body, referring to the lance-like shape of young shad. The word petenense refers to Lake Peten in the Yucatan, the species type locality. Threadfin shad are usually easily distinguished from gizzard shad by the fact that the upper jaw does not project beyond the lower jaw. The anal fin usually has 20-25 rays, as opposed to 29-35 rays found in gizzard shad.