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Bio 3: Homework #5 1. The three components are receptor/sensor, intergrator, and effector. The receptor/sensor measures some parameter in the internal environment. The integrator does three things: it takes information from the receptor/sensor, evaluates information, and sends a signal to the effector to respond. The effectors do something to modify the internal environment. Negative feedback is the control. It reverses the aspect of the body that needs to be modified. 2. The internal environment of the human body refers to the interstitial fluid, the extra cellular fluid that bathes the cells of the body, and the plasma blood of a body. 3. A circulatory system consists of a pump, blood and vessels. 4. The four changes are the right atria, the left atria, the right ventricle, and the left ventricle. The right atria is thinly muscled, the blood comes from the rest of the body and it goes into the right ventricle. The right ventricle is thickly muscled, the blood comes from the
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Unformatted text preview: right atria, and the blood goes to the lungs. The left atria is thinly muscled, the blood comes from the lungs, and it is pushed down to the left ventricle. The left ventricle is thickly muscled, the blood enters from the left atria, and is pushed into the systematic loop, which distributes the blood to the rest of the system. 5. Arteries are thickly muscled and have a relatively large diameter. They branch into arterioles. Veins are less muscled and have the largest diameter. Smaller veins are called venules. Capillaries are the smallest in diameter and have thin walls, and are very abundant. They form capillary beds. 6. The first form is 7%, dissolved in CO as plasma. The second is 23%, in transit in red blood cells. The third form is 70% dissolved as bicarbonate. 7. Breathing contracts the diaphragm and decreases pressure on the thoracic cavity, thereby increasing its volume. Rib expansion expands the volume of the thoracic as well....
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This note was uploaded on 04/04/2008 for the course BIO 3 taught by Professor Baldo during the Fall '07 term at UCSC.

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