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As bread is full of starch, the enzyme secreted in our mouth for digesting starch start breaking down carbohydrates present in starch converting it into sugar. Hence, it tastes sweeter after sometime.
The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow.
The 'Dehydration/Electrolyte Theory' ... It speculates that a significant disturbance in fluid or electrolyte balance, usually due to a reduction in total body exchangeable sodium stores, causes a contraction of the interstitial fluid compartment around muscles and a misfiring of nerve impulses, leading to cramp.