Guys I have a project, an android app that uses pulse rate and body temperature and blood pressure data.
Is it possible to plug multiple sensors on an arduino uno? I'm seeing only one ground port here.
johnzkee92:
Is it possible to plug multiple sensors on an arduino uno? I'm seeing only one ground port here.
That's what wire is for! 
There are actually at least four ground connections on an Arduino UNO but only two are marked as such.
If you don't want to solder you can use a breadboard. You connect the Arduino ground to a breadboard when then plug as many ground connections as you like into the breadboard.
Edit: I was wrong about only two grounds being marked. There are three marked and two unmarked.
There are actually at least four ground connections on an Arduino UNO but only two are marked as such.
3 marked on mine, both the genuine one and the clone, plus the unmarked on on the ICSP header.
Like most similar products, the board 'ground' is common to a group of outputs, so they share one ground. As already stated, just link your board ground to a 'bus bar' so you can then connect as many wires as you like.