[DAT Question of the Day, Click Display Images To See] + Join us on Facebook<http://datquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=d2429b9077&e=61d7ba7392> + Connect on Twitter<http://datquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=e1c498d8b4&e=61d7ba7392> Human Respiratory Rate The human respiratory rate is regulated by chemoreceptors that monitor which of the following? A. oxygen B. methane C. pH levels D. hemoglobin E. proton levels To see the solution and images, visit the following link: http://datquestionoftheday.com/biology/human-respiratory-rate/<http://datquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=6b0674c6b5&e=61d7ba7392>