Explain how valves, flexible walls and surrounding muscle activity support venous blood flow towards the heart.
Tę umiejętność sprawdza 5 zadań wzorowanych na arkuszach IB z lat 2024–2026.
Which statement reliably distinguishes a vein from an artery? A. A vein carries blood towards the heart B. Every vein carries oxygen-rich blood C. Veins are the only vessels containing smooth muscle D. Veins must have thicker walls than the arteries beside…
Biological function depends on coordinated structures and recurring processes. (a) Outline how chromosome behaviour in mitosis produces genetically equivalent cells. (b) Describe the production of mRNA in the nucleus. (c) Explain how arterial and venous…
Which combination is typical of many veins carrying blood back from the limbs? A. Valves present; walls relatively thin B. Valves absent; walls thicker than comparable arteries C. Valves present; complete absence of muscle D. Valves absent; walls one…
Which property helps blood flow through a vein when surrounding skeletal muscle contracts? A. A very rigid non-compressible wall B. A flexible wall that can be compressed C. A wall consisting only of a single fenestrated layer D. A lumen always narrower than…
Distinguish the structure of arteries from that of veins.
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