The changes in metabolic activity associated with endothermy and the change from gill to lung respiration has led to changes in vertebrate circulatory systems. Veins between two capillary networks are ...

The circulatory system is the heart and all the blood vessels in the body which carry cells and substances to all its parts. The heart is a large muscular organ which pumps blood to the lungs and ...

Spread the loveCardiovascular training, often referred to as cardio, is an exercise system primarily focused on improving the ...