Neuro Hormonal Influences on the Cardiovascular System Flashcards
What type of sympathetic receptors are on the heart?
Beta-Adrenergic Receptors, located on the SA node and myocardium
What Neurotransmitter is released by the SNS?
Norepinephrine
How does SNS stimulation affect the heart?
Increases overall heart activity:
- HR (chronotropy)
- Force of Contraction (inotropy)
How does SNS stimulation affect the coronary arteries?
Leads to coronary artery dilation
Peripheral blood vessels contain what type of receptor?
alpha-adrenergic receptors
SNS stimulation to peripheral blood vessels causes?
- Vasoconstriction
- Increased peripheral vascular resistance
How might the SNS affect the adrenal medulla?
Secrete the catecholamine epinephrine
How does Dopamine and Epinephrine affect CO?
Increases CO
What does Atropine affect?
Increases HR in presence of critical bradycardia
Which nerve places the primary parasympathetic influence on the heart?
Vagus Nerve
Vagus nerve primarily influences what heart rate?
Resting HR
What occurs to the heart secondary to Parasympathetic Stimulation?
- Decreased HR
- Decreased Force of Contraction
- Decrease AV node conduction speed
Impact of direct parasympathetic influence on blood vessels?
Vasodilatory effects to:
- Bowel
- Bladder
- Genitals
Patient with a heart transplant are reliant on what for sympathetic influence
Dependent on catecholamine stimulation on beta-adrenergic receptors
Patients with heart transplant will present with what HR at rest?
Elevated resting HR, to achieve normal CO