Feb12Lec - Circulation Respiration How Food and Oxygen Get...

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1 Circulation & Respiration: How Food and Oxygen Get Into My Cells Today’s Lecture will help you with Lab #2 & Lab #3 (Clicker Question) Any answer is correct--. Randy would have chosen C – he is “evolving from E. . (ppt) Last Class Covered : Accessory organs of digestion [pancreas, and liver] Intestine & passage of gas Today’s Class Covers: Circulatory System & exchange of gas (ppt) Food absorbed by small intestine enters the circulatory system [arrows mean travel to] liver heart lungs (pick up oxygen, and releases carbon dioxide) heart body (ppt) Tying it all together - IMPORTANT Photosynthesis: Making organic matter from carbon dioxide and water as well as nitrogen, p hosphorous and sulfur using the Sun’s energy. Eating and Digestion: Breaking down the ingested food mechanically, chemically and enzymatically into small molecules and atoms. Absorption: transport of the small molecules and atoms across the mucosa “into” the body. Circulation: Transport of small molecules and atoms from the intestines to the cells in the rest of the body. Transport of oxygen from the lungs to the cells in the rest of the body. Transport of carbon dioxide from the cells to the lungs where it is expired. Cellular Respiration and Biosynthesis (Monday)
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2 Photons of light hit plant CO 2 + water + chlorophyll carbohydrates humans eat plants bolus of food formed by chewing & salivary amylase + mucous (carbohydrates begin being digested) peristalsis moves bolus down esophagus stomach churns and protein digestion begins [after HCL activates pepsinogen to form pepsin], gastric lipase begins lipids digestion = mixture now called chyme moves to duodenum of small intestines pancreas secretes sodium bicarbonate + digestive enzymes (for lipids, proteins, nucleic acids, carbohydrates): liver secretes bile (emulsifies fats) both pancreas & liver secrete to small intestine mixture now called chyle [major site of chemical digestion & nutrient absorption, and water absorption large intestine [water absorption , Vit K production, mineral uptake] rectum anus. An explanation of the Surface Area to Volume relationship of cells & the need for a circulatory system: In order to understand why a circulatory system is required to bring oxygen, nutrients, hormones, immune system and water to cells [and remove wastes, carbon dioxide], you need to understand the surface area to volume relationship. As you increase the volume of a sphere, you decrease the surface area to volume ration. To help you think about this—imagine ordering an 8 oz cup of coffee and a 16 oz cup of coffee. The 16 oz cup holds twice as much volume, but is it actually twice as big?? The answer is no. If you measured the outside area making up the cup you would have the surface area. Thus, the volume was double in the larger cup, but the surface area did not increase at the same rate.
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Feb12Lec - Circulation Respiration How Food and Oxygen Get...

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