Control of Heart Rate (AQA A-Level Biology): Flashcards
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Autonomic nervous system function
Autonomic nervous system function
Controls involuntary activities without conscious input
Sympathetic nervous system effect
Sympathetic nervous system effect
Stimulates effectors & accelerates activity (fight or flight)
Parasympathetic nervous system effect
Parasympathetic nervous system effect
Inhibits effectors & reduces activity (rest state)
Myogenic meaning
Myogenic meaning
Contractions originate from within the muscle tissue itself
Sinoatrial node (SAN) function
Sinoatrial node (SAN) function
Heart's natural pacemaker, generates contraction stimulus
Medulla oblongata role in heart rate
Medulla oblongata role in heart rate
Contains centres that increase & decrease heart rate
Chemoreceptors location & detection
Chemoreceptors location & detection
Carotid arteries; detect pH changes from levels
Response to increased in blood
Response to increased in blood
pH drops, chemoreceptors signal medulla, heart rate increases
Pressure receptors location
Pressure receptors location
Carotid arteries & aorta walls
Response to high blood pressure
Response to high blood pressure
Parasympathetic system activated, heart rate decreases