Physiology Venous return to hea during quiet standing is facilitated by all of the following factors, except: A Calf muscle contraction during standing B Valves in perforators C Sleeves of deep fascia D Gravitational increase in aerial pressure 💡 Explanation Venous return to hea during quiet standing is facilitated by all of the following factors, except: ✓ Correct Answer: D. Gravitational increase in aerial pressure