Cardiac muscle (heart muscle) is involuntary striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle.These three types of muscle all form in the process of myogenesis. The cells that constitute cardiac muscle, called cardiomyocytes or myocardiocytes, contain only three nuclei.nother histological difference between cardiac muscle and skeletal muscle is that the T-tubules in the cardiac muscle are bigger and wider and track laterally to the Z-discs. There are fewer T-tubules in comparison with skeletal muscle.
The four main economic variables (in macroeconomics) are 1. Real Gross Domestic Product (GDP) 2. The unemployment rate 3. The inflation rate 4. The interest rate-----5. Level of the stock market 6. Exchange rate
Even the price of milk is strongly influenced by government policy in the United States. An economy is a system whereby goods are produced and exchanged. Without a viable economy, a state will collapse. There are three main types of economies: free market, command, and mixed. The chart below compares free-market and command economies; mixed economies are a combination of the two.