Answer:
Rocky start!
Explanation:
My teachers gave us a lot of work and testing last week and today they switched the workload so I'm left trying to catch up with it. But today will get better!
Insurance companies, schools, and religious groups.
Answer:
to be sure a person has no heart disease to be sure a person has no heart disease.
to identify the risk of muscle or bone defects to avoid injury on the athletic field to identify the risk muscle or bone defects to avoid injury on the athletic field.
and also
to keep other players from getting infected by any transmittable diseases.
Explanation:
They do this in order to check if they are healthy enough to do the fitness so they don't collapse or their heart does not stop pumping in the middle or spread any germ
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.
