The heart pumps blood around your body, It delivers oxygen and nutrients to the cells and removes waste products, It consists of four chambers: two upper chambers called the right and left atria (singular:...
The contraction of the right side of the heart occurs at the same time of the left side contraction, Therefore, the pumping of deoxygenated blood from the right ventricle and the pumping of the...
Animals obtain their requirements of energy in the form of food, after its digestion, the soluble food substances are absorbed, but still remains the problem of their transport and distribution to the various tissues...
