BIO 3302 Lecture Notes - Lecture 2: Sinus Venosus, Electrocardiography, Vagal Tone
14 Sep 2017
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Document Summary
The circulatory fluid in the circulatory system of an octopus is haemolymph. No octopus has a closed system - uses blood not haemolymph. The resistance of the circulatory system is likely higher in a crab than in a clownfish. No the vertabrate clownfish uses a closed system which has higher resistance that the open system in the invertabrate crab. Air is better than water because of the increase of oxygen concentration. Systemic blood pressure is higher with higher metabolic rate. Simply from heart to gills to body and back to heart. 4 chambered heart with four chambers in series. Gills between heart and systemic circulation in a single circulation. Gills are fragile --> cannot put too much pressure on blood flowing through gills. Gas exchange area, very thin and fragile, low blood pressure. Pulmonary goes from heart to lungs and back to heart. Blood on one side of thin membrane and air on the other side.
