Effects of cross country skiing on the cardiovascular system?

Is water a component of lymph? Is Klinefelter's syndrome the same as Down syndrome? What does it mean when a girl vagaina itches? Can a massage therapist catch HIV? What is the fear of chemicals? What pathogen is found in WILD game meat? What is the System that relays commands to skeletal muscles and stimulates glands and other muscle so that the organism may continue to live and respond to stimuli? What can you eat with a crown on your tooth? Does e coli produce hydrogen sulfide? How are the nervous system and endocrine system similar and how are they different? What is NASH disease? Do fetal lungs contain small amounts of atmospheric air in the alveoli? What kind of doctor for puffy eyelids? Are reese's pieces gluten free? What is grade 1 anterolisthesis of L5 on S1 related to severe facet hypertrophy? What are the first signs of preagnancy? Does rib fractures cause muscle spasms? Does love bites turn brownish? How do you fix a burn mark from toothpaste on a pimple? What is the specific way that blood takes from the lungs to the heart throughout the body back to the heart and back to the lungs?