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:
Explanation:
Autism spectrum disorder, or better known as ASD, is a neurological and developmental disorder. It affects how a person interacts and acts with other people; how it communicates and learn. There are a range of signs/symptoms for this type of condition, but the most commons are: difficulty with social interaction and communication; such as, making little eye contact, having difficulties following a normal conversation, having trouble understanding the point of view of another person, etc. They also show repetitive behaviors and patterns, such as, repeating words or phrases, having an intense conversation of a certain topic, etc.
