Factors affecting heart rate Flashcards
1
Q
What factors affect heart rate?
A
Gender Autonomic nervous system (ANS) Age Circulating hormones such as adrenaline and thyroxine Activity and exercise Temperature The baroreceptor reflex Emotional states
2
Q
The SA node, also known as the…
A
Pacemaker of the heart
3
Q
Describe the sequence of events leading to a heart ‘beat’ involving the electrical impulses in the heart.
A
The electrical impulse is initiated in the SA node
The impulse passes to the AV node, which sends it to the AV bundle (bundle of His)
The impulse passes into the right and left bundle branches and ultimately into the Purkinje fibres, causing the ventricles to contract
The ventricles relax
4
Q
What does NSR stand for?
A
Normal sinus rhythm
