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10 Cards in this Set
- Front
- Back
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Vascular Shunt order |
Proprio (movement), Baro (BP) and chemo (acidity) detect increases Inform VCC Uses Symp. NS Pre-cap sphincters open/close to muscles/non-vital organs Vaso-dilation/constriction of arterioles |
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Venous Return Overview |
Volume of deO2 blood returning to heart per beat GRUMPS Increase Q because of Starling's Law |
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Symp NS |
Part of Autonomic NS that speeds up HR |
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Para-symp NS |
Part of Autonomic NS that decreases HR |
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How is HR increased through Neural Control? |
(Chemo, Baro and Proprio) Receptors send an impulse to CCC CCC sends impulse through Symp NS to SA node SA node speeds up fire rate |
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Conduction System Order |
SA node generates impulse (causes atrial systole) AV node collects and waits 0.1 sec to allow atrial systole to finish Sends down Bundle of His, down Bundle Branches and Purkinje Fibres- which distribute impulse through ventricular walls to cause Ventricular Systole |
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What is Cardiovascular Drift? |
An increase in HR during exercise in high temperatures. |
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Describe Intrinsic Control of the Heart |
Thermoreceptors detect an increase/decrease in temp. Heart senses an increase/decrease in amount of blood returning (Venous Return). Therefore the S.A node can act on that information |
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Describe Hormonal Control of the Heart |
Adrenaline is released through the adrenal gland before exercise. Leads to an anticipatory rise in HR |
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Describe Neural Control of the Heart |
Three receptors (Baro, Chemo, Proprio) detect changes in Blood Pressure, Acidity, Movement. Passed onto the CCC (in medulla oblongata). Uses accelerator/vegus nerve to increase/decrease speed of SA node fire rate. Increased/Decreased HR |
