Blood Vessels 2, Venous return

Venous return MCQs. Leave answers in comments section for marking. 1. Which of the following structures contain valves to ensure one-way flow of blood? a. pulmonary arteries b. systemic veins c. systemic arteries d. venules 2. Choose one true statement; blood flows from central to peripheral veins blood flows from proximal to distal leg veins blood flows from deep to superficial veins blood flows from superficial to deep veins 3. Deep veins in the leg will drain blood into the; a. superior vena cava b. inferior vena cava c. jugular veins d. left atrium 4, Which of the following is not a mechanism of venous return? a. gravity b. contraction of skeletal muscles c. negative pressures in the abdomen generated by upward movement of the diaphragm during expiration d. positive pressures in the abdomen generated by upward movement of the diaphragm during expiration