The sternum is not all solid bone, it has a section of cartilage at the tip as it approaches the abdomen. Therefore it is easy for it to be fractured if pressure is exerted below the line marked by the two nipples, which is a place where it is strong enough to be safely pressed by the heel of the hand.
Intestinal blood flow is critical for digestion, as well as a key element of overall well-being. The O2 consumption of the small intestine is more controlled than is the large.
Ionic compounds are formed from strong electrostatic interactions between ions, which result in higher melting points and electrical conductivity compared to covalent compounds. Covalent compounds have bonds where electrons are shared between atoms.
