BIOL 1010 Chapter Notes - Chapter 26: Partial Pressure, Cellular Respiration, Hemoglobin
14 May 2017
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Each kind of gas in a mixture accounts for a portion of the total pressure of the mixture. Each gas has a partial pressure- molecules of each kind of gas will diffuse down a gradient of their own partial pressure independently of the other gases. The co2 produced as a waste product of cellular respiration diffuses its own partial pressure gradient out of tissue cells and into the capillaries. Diffusion down partial pressure gradients also accounts for gas exchange in the alveoli. Most animals transport it bound to proteins called respiratory pigments (distinctive colours). Almost all vertebrates and many invertebrates use hemoglobin- an iron containing pigment that is red. Each of your red blood cells is packed with about. A single vertebrate hemoglobin molecule consists of four polypeptide chains of two different types. Attached to each polypeptide is a chemical group called a heme at the centre of which is an iron atom.
