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| Description: Veins are the body’s main blood reservoir. The amount of blood in the veins changes depending on activity level. Blood pressure in veins is low. One-way valves, activity of skeletal muscle, and respiratory muscle action all help move the blood toward the heart. Picture Stats: Views: 142 Filesize: 347.85kB Height: 1036 Width: 1249 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47570 |