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.
D short term stressor because major life changes deal with your self and there stress is permanent.
Puberty is when adolescents reach sexual maturity and become capable of reproduction.
<h3>What is an Adolescent?</h3>
An adolescent may be defined as a period of an individual's life who has expired the phase of childhood and are about to enter into the phase of adulthood.
During the time of adolescents, physical and emotional changes occur and are influenced by the endocrine system, which releases hormones into the bloodstream.
In adolescents, puberty characterizes the commencement of adolescence when the reproductive abilities of adolescents evolve.
Therefore, it is well described above.
To learn more about Adolescents, refer to the link:
brainly.com/question/1956818
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Pretty shore the answer is D
