Count to 10 - Anaesthetic Primary Podcast EP25 – Regional Circulation | Anaesthetic Primary Topic | Cardiac Physiology | CT10
Aug 28, 2024
Dive into the fascinating world of regional circulation and discover how systemic circulation and the physics of blood flow influence blood pressure. Explore the differences between arterial, capillary, and venous systems, along with the principles of Ohm's law and its applications to blood flow. Uncover the complexities of microcirculation and the role of baroreceptors in blood pressure regulation. Learn about the cardiovascular control arc and how various factors, including sympathetic tone and hormones, modulate vascular resistance.
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Arterioles Control Peripheral Resistance
- Arterioles are the primary controllers of total peripheral resistance and are regulated by radius, viscosity and vessel length.
- Local myogenic and metabolic autoregulation maintain organ flow despite pressure changes, especially in brain and kidney.
List Local And Systemic Vascular Controls
- Consider both local (myogenic, metabolic) and systemic (autonomic, hormones, reflexes) factors when explaining arteriolar tone.
- Highlight sympathetic α1 effects and circulating agents like adrenaline, angiotensin II and ADH in answers.
Capillary Reserve And Slow Exchange
- Microcirculation includes arterioles, meta-arterioles, capillaries and venules, with capillaries optimized for slow exchange.
- Only ~25% of capillary beds are open at rest, leaving large reserve capacity that can be recruited with demand.