When a person is making cardiovascular gains through aerobic activity they are increasing the amount of what to the heart and lungs?

When a person is making cardiovascular gains through aerobic activity they are increasing the amount of oxygen to the heart and lungs. This actually keeps the heart and lungs of a person very healthy. It decreases the chance of heart diseases.

depression is an ongoing sadness\lack of motivation. you feel and feel like its never going to get better. you're so sad to the point you think of death.

anxiety is an ongoing feeling of paranoia\ feeling like everyone is watching you and making fun of you. you get nervous easily and feel like the room is spinning.  

yes, they cause death every year. its a long, exhausting battle. only few make it through as sad as it sounds.

explanation: