Quiz 3 Key - 3. (2pts) Which atrium (left or right)...

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Quiz # 3 Discussion Section - March 10 th /11 th Name: ___________________________________ Discussion time: _______________ 1. (2pts) List two ways in which animals avoid breaking down their own body during digestion. Hydrolytic enzymes are encapsulated in a lysosome , where macromolecule digestion takes place. The digestive lining is protected by mucus secretions . In the low pH of the stomach, cells are continuously replaced . 2. (2pts) What structural adaptations of both the respiratory and the digestive system allows for an increased rate of diffusion? Tissues in both types of systems are highly folded, drastically increasing the surface area over which diffusion can take place
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Unformatted text preview: 3. (2pts) Which atrium (left or right) receives oxygenated blood from the lungs in a four chambered heart? The left atrium receives oxygenated blood from the lungs. The right atrium receives oxygen poor blood from the rest of the body. 4. (2pts) Why do we breathe in oxygen?? We require oxygen for cellular respiration , the retrieval of energy stored in food to make ATP. Oxygen is the last electron acceptor in the electron transport chain of oxidative phosphorylation. 5. (2pts) List the two major functions of the excretory system. 1. Maintains the volume/concentration of body fluids 2. Removes toxic nitrogenous wastes (from breakdown of proteins/DNA)...
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