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.
The head and the rear of the body is not segmented. The digestive system of species in this phylum runs the length of the body. Food is taken in at one end of the body and expelled at the other end. Annelids have two sets of muscles that help them move.here are about 15,000 species in this phylum. The phylum includes earthworms, leeches, and marine worms known as polychaetes. Species in this phylum have metameric bodies. Metameric bodies are divided into segments called annuli. The annuli are covered in tiny hairs called setae. Setae help the worms move.