You have been advised to check your pulse during exercise in order to monitor your heart rate. what is happening in your heart as your pulse is produced?

Its it contracting allowing a pulse to be created as you work out. The lub dub sound of your heart is basically your pulse. As the heart contracts faster as you work out due to you exerting yourself to an intense workout. 

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.