The coronary circulation consists of the coronary arteries, which branch off of the aorta and carry oxygen-rich blood to the heart muscle; and coronary veins, which carry deoxygenated blood to the coronary sinus, which empties into the right atrium.he coronary circulation consists of the coronary arteries, which branch off of the aorta and carry oxygen-rich blood to the heart muscle; and coronary veins, which carry deoxygenated blood to the coronary sinus, which empties into the right atrium.
Quick Answer. The differences between micro- and macro-marketing pertain to the scope of a businessâ approach. Macro-marketing takes a global view while micro-marketing works on a smaller scale. Continue Reading.
To do so, you need to look at the external environment. Definition of an External Environment. An external environment is composed of all the outside factors or influences that impact the operation of business. The business must act or react to keep up its flow of operations. The external environment can be broken down into two types: the micro environment and the macro environment. Types of External Environments