During venous return, skeletal muscle contraction compresses deep veins and moves blood toward the heart. Which structural feature of veins prevents backflow in this process?

During venous return, skeletal muscle

Multiple choice — select the best answer

AA thicker tunica media with more smooth muscle than arteries
BPaired cuspal valves (venous valves) projecting from the tunica intima
CSemilunar valves located at the ventricular–vascular junctions
DElastic recoil of the tunica externa generated by dense collagen bundles

✓ Correct answer: B. Paired cuspal valves (venous valves) projecting from the tunica intima Veins contain paired pocket-like valves that project inward from the tunica intima; these valves open when blood flows toward the heart and snap shut to prevent retrograde flow, making the muscle pump effective.

.q-expl{display:block!important}.q-opt[data-idx="1"]{border-color:#16a34a;background:#f0fdf4}.q-opt[data-idx="1"] .oltr{background:#16a34a;color:#fff}.q-opt{cursor:default!important;pointer-events:none}

Keep practising. Use the free Massage Therapy MBLEx PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.

Free PDF Video walkthrough

← Previous 🎲 Random question ↩ Back to all questions

Keep practising

During venous return, skeletal muscle contraction compresses deep veins and moves blood toward the heart. Which structural feature of veins prevents backflow in this process?

Related questions

Free practice here. Timed mocks when you are ready.