Introduction. Myocardial infarction is the technical name for a heart attack. A heart attack occurs when an artery leading to the heart becomes completely blocked and the heart doesnât get enough blood or oxygen. Without oxygen, cells in that area of the heart die (called an infarct).A heart attack is a medical emergency. heart attack occurs when an artery leading to the heart becomes completely blocked and the heart doesnât get enough blood or oxygen. Without oxygen, cells in that area of the heart die (called an infarct). A heart attack is a medical emergency.
Media production managers work behind the scenes in film, television, radio and video. They play a key role in program production by organizing schedules, budgets and people.
Gross primary production and net primary production Gross primary production (GPP) is the amount of chemical energy as biomass that primary producers create in a given length of time. (GPP is sometimes confused with Gross Primary productivity, which is the rate at which photosynthesis or chemosynthesis occurs.) Some fraction of this fixed energy is used by primary producers for cellular respiration and maintenance of existing tissues (i.e., growth respiration and maintenance respiration).