Explain how valves, flexible walls and surrounding muscle activity support venous blood flow towards the heart.
Tę umiejętność sprawdzają 3 zadania wzorowane na arkuszach IB z lat 2023–2026.
Directional processes depend on structures that constrain movement. (a) Outline how structures in the human circulatory system limit backward blood flow. (b) Explain why transmission across a chemical synapse proceeds from the presynaptic to the postsynaptic…
How can the relatively compliant walls of a vein help return blood from a limb? A. They resist all external compression B. They replace the need for a pressure gradient C. They can be compressed by nearby skeletal muscles, helping propel blood through valves…
Compared with the corresponding artery, which feature generally characterizes a vein transporting blood back from a limb? A. A relatively wider lumen and thinner muscular wall B. A thicker muscular wall that generates the heartbeat C. No endothelial lining D.…
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