BISC208 Lecture Notes - Lecture 13: Partial Pressure, Cooperative Binding, Blood Sugar
14 May 2019
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Homeostasis- is when an organism"s body actively maintain stable conditions (i. e. temperature, blood sugar, metabolism, heart rate, blood pressure) Goal- maintain equilibrium around a specific point or value known as a set point. Negative feedback: counteracts direction of the stimulus. Positive feedback loop: maintains the direction of the stimulus. High body temp- enzymes denature and lose their function. Low body temp- enzyme activity decreases by 50% for every 10c drops. Endotherm- produces enough heat to warm its own tissues. Ectotherm- relies on heat from the environment. Partial pressure- fraction of the air the gas comprises x total pressure exerted by entire mixture (atmospheric pressure) chem review. For cells to get oxygen, partial pressure must be lower inside cell/body than the atmosphere. Partial pressure of gas in contact w the water. Warmer climate=warmer temp=less oxygen availability= decrease of diversity. Rbc- lost nuclei and most organelles as they mature. Large number of neurons, aggregated into clusters called ganglia.
