Which upper chamber of the heart contains oxygen-rich blood?

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

Now think of ways in which using healthcare services effectively can foster your health and ways in which not being aware of them is a health risk

You can add phyisical activity minutes to your day by uising a leaf blower instead of a rake