Target zone (this is mrs hoards study thing isn't it?!)
Yes
Fat builds up plaque in the arteries that obstructs blood flow and overall hinders function of the heart.
Affect is a verb. Effect is what a cause does. Training is a cause, therefor the effect is losing weight. And you are affecting your health positively.
no
Morphine is a known respiratory depressant.
The Respiratory System
respiratory system
In fact one should not participate in marathon race without proper cardio vascular structure of the participant, otherwise one may encounter heart problems by joining marathon race without proper training before hand.
Moderate cardio can be beneficial after a heavy workout due to the anti-latic acid effects of pumping blood round the body, However this should be kept relatively short say 10-15 minutes maximum as prolonged cardio may effect reduce the effects of a heavy weights session.
p
badly
infections that effect the repertory system