Ganong | Physiology Mcq Pdf

A) Rapid influx of Na+ through fast voltage-gated channels B) Inward “funny current” (If) carried mainly by Na+ and K+ efflux decrease C) Exclusive T-type Ca2+ channel activation D) Na+/Ca2+ exchanger operating in reverse mode

A) Increased PaCO2, increased pH B) Decreased PaCO2, increased pH C) Decreased PaCO2, decreased pH D) Increased PaCO2, decreased pH ganong physiology mcq pdf

Explanation: Hypotension reduces baroreceptor firing → increased sympathetic outflow to heart (β1 receptors) → increased HR. Vagal tone decreases, not increases. A) Rapid influx of Na+ through fast voltage-gated

A) Decreased renin release B) Increased angiotensin II formation C) Decreased aldosterone secretion D) Increased ANP release increased pH B) Decreased PaCO2

Explanation: SA node pacemaker activity relies on the hyperpolarization-activated funny current (If) – mixed Na+/K+ inward current, plus decreasing outward K+ current.