Biology 2601A/B Lecture Notes - Lecture 13: Sinus Venosus, Coronary Circulation, Stroke Volume

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Lecture 13: the heart, blood and oxygen association curves. Humans: heart rate = 60-180 beats/min and stroke volume = 70-120. Highly resistant to fatigue and loaded with mitochondria. Pockets are perfused with blood and oxygenated not an effective system. Bulbus arteriosus damps pressure oscillations, is elastic. Spongy myocardium this is how the heart obtains oxygen. As deoxygenated blood from the body enters via the sinus venosus into the atrium, which then fills the ventricle by the way of weak muscular contractions. In the ventricle, the blood encounters spongy myocardium, which contains internal spaces whereby oxygen can diffuse and oxygenate the blood adjacent. Ventricle pumps recently oxygenated blood via bulbus arteriosus to the rest of the body. Physiological problems associated with teleost heart include: loss of pressure in oxygenating blood across the gills (resulting in low flow rate, heart is thus unable to receive freshly oxygenated blood (resulting in lower metabolic activity)

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