void FixedUpdate ()
    {
        //update BPM_Multiplier
        BPM_Multiplier = Heart_Rate / 72f;
        //HeartSphere = GameObject.Find("HeartSphere").GetComponent<Transform>();

        //toggle size of heart to show systole
        //toggle systole/diastole if timer > BPMMultiplier
        if (timer.ElapsedMilliseconds >= (Systole ? 300 : 500) * (1 / BPM_Multiplier))
        {
            //toggle heart size to show it pumping
            Ventricle.localScale = Ventricle.localScale * (Systole ? 1.25f : 0.8f);
            Atrium.localScale = Atrium.localScale * (!Systole ? 1.25f : 0.8f);
            //reset timers
            timer.Reset();
            timer.Start();
            Systole = !Systole;

        }

        //update cardiac output
        //poll each output of each vein attached
        //set output based on function% and if heart is in systole or dystole
    }