bio physio study guide

bio physio study guide - How does your body maintain blood...

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How does your body maintain blood glucose levels between 80 and 100 mg/dL? Answer: After a carb. Rich meal skeletal muscles remove excess glucose from the blood and store it as the polysaccharide Glycogen . This process is stimulated by the hormone insulin which is release by the Beta cell in the islets of Langerhans in the Pancreas. When blood glucose levels decrease, the liver secretes glucose into the blood stream by glycogenesis , the breakdown of glycogen is stimulated by the hormone glucagons , which is secreted by the alpha cells of the pancreatic islet of Langerhans. The secretion of Glucagon and Insulin is regulated by the amounts of glucose in the blood stream and vary conversely. The conversion of glucose to glycogen is a parasympathetic process, while the conversion of glycogen to glucose is a sympathetic process. How does food move through the human digestive tract? Answer: Peristalsis. Identify two ways in which a cow’s digestive system differs from a lion’s digestive system. Answer: Ruminants have a 4 chambered stomach, the first 3 stomachs are followed by a fourth true stomach for absorbtion. The runmen, the second stomach, serves as a fermentation area for bacteria to break down the chewed food. The cud is regurgitated to further break down the fibers in the food and increase surface area for microbial attachments. Once swallowed(second time) the food is further digested in the rumen and then passed on to the third stomach and then the true stomach where gastric juices finally affect the food. Carnivores lack smooth teeth for grinding but rather have pointed sharp teeth for biting and tearing their prey. Carnivores have digestive enzymes that can act directly on animal cells whereas herbivores need to break down the cell walls of plants before the nutrients can be digested. How does the stomach help with arterial PO 2 levels? When Intrinsic factor is released it helps with the absorption of the vitamin B12 which is necessary for the production of hemoglobin. Describe two ways to increase your blood pressure . Answer: Arterial BP depends on two factors: cardiac output and resistance to blood flow in the vascular system. An increase in blood pressure could be the result of either an increase in heart rate or blood volume. Blood pressure falls if the heart rate slows or if
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This note was uploaded on 04/22/2008 for the course BIO 160 taught by Professor Clymer during the Summer '07 term at Nevada.

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bio physio study guide - How does your body maintain blood...

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