I think it's A, but I'm not 100% sure
Things like weight, time spent drinking , gender .. etc.
Depends on what you're looking at. Colors seem to have a role in how we feel, out heart rate. But being able to look at calming scenery, of bright greens and blues is calming because it's the colors of life, and our minds sees the colors and we instantly become more calm. Green is calming because it's color that is found quite frequently in nature, so essentially it's good.<span />
The SA Node is the heart's normal pacemaker. When the SA Node depolarizes, electrical signal spreads through the atrial muscle causing contraction.
Explanation:
Inherent rhythmicity / automaticity - The property of the pacemaker cells of the heart to start electrical sequence of depolarization and repolarization.
SA Node or Sino-atrial Node generates the electrical signal.
The electrical signal passes through internodal pathways, atrial fibres, atrioventricular node (AV Node), the bundle of His, Purkinje fibres, right bundle branch, left bundle branch.
Systole - Contraction of cells when the electrical signal of depolarization reaches the contractile cells.
Diastole - Relaxation of cells when the electrical signal of repolarization reaches the myocardial cells.
