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.
Answer:
food spoilage
Explanation:
Food contamination is when food is contaminated with microorganisms or substances and eating it could result in food borne disease. Food spoilage is any undesired change in the natural color, taste or texture of food items that makes it unfit for consumption because it has lost its quality and nutritional value.
Internal Conflict: the psychological struggle within the mind of a literary or dramatic character, the resolution of which creates the plot's <span>suspense.
External Conflict: the </span>struggle between a literary or dramatic character and an outside forcesuch as nature or another character, which drives the dramatic actionof the <span>plot</span>
D. The petting animals option. Mainly because that answer has nothing to do with food and everything to do with regular germs :)