How much blood the heart pumps for every square meter of surface area (cardiac index) varies with the age of the individual. For children ages 10Â­13, the average cardiac index is 2.75 liters/m 2 /minute at a resting state. Multiply your body surface area by the cardiac index (2.75 l/m 2 /minute) to determine the liters of blood pumped by your heart in one minute (cardiac output). 2 /minute= ____liters per minute. How does your volume per minute compare to a 2 liter beverage bottle? .
Locomotion in Annelida Before we discuss the details of locomotion in annelids, we have to recapitulate the major subdivisions of the phylum Annelida.Phylum Annelida contains Polychaeta, Oligochaeta and Hirudinea.ocomotor structures. So, Locomotion is the result of co-ordinate effort of all these. Locomotion in Annelida. Before we discuss the details of locomotion in annelids, we have to recapitulate the major subdivisions of the phylum Annelida.
Annelids are considered members of the Lophotrochozoa, a super-phylum of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments. Each segment has the same sets of organs and, in most polychates, has a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly defined or absent in others, and Echiura and Sipuncula show no obvious signs of segmentation.