Answer:
B. Blood flows twice through the heart in one complete circuit of the body.
<h2>What is the mammalian circulatory system?</h2>
The circulatory system of mammals, whose central organ is a four-chambered heart, is a perfectly organized system of blood vessels: arteries, veins and capillaries.
Double circulation is the a circulatory system in which blood flows through two separate circuits, as pulmonary and systemic.
<h2>What is the circulatory system?</h2>
The system of organs and tissues, including the heart, blood, blood vessels, lymph, lymphatic vessels, and lymph glands, involved in circulating blood and lymph through the body. The circulatory system allows blood to circulate throughout the body and transport nutrients, oxygen, hormones, carbon dioxide and blood cells to every part of the body in order to nourish it and help the body fight diseases. it also helps stabilize the normal body temperature and pH, maintaining homeostasis.
