What causes swelling, redness, and itching caused by an allergic reaction? Harmful Pathogens? T Cells? V Cells? or Histamine?

In strenuous physical activities it is recommended to warm up and cool down ? true or false ?

Aphysician performs a four vessel autogenous ( one venous three atrial) coronary bypass on a patient who has

What a self improvement for a busy person who had difficulty finding time to exercise/ dropping out of clubs and activities/ refusing social invitations from friends/ scheduling daily invitation activity/ sleeping fewer hours at night