Lab 6 Bios

Digestive and Respiratory System Worksheet

Name:

Before answering the questions below, log in to ADAM and view the clinical animations for Peristalsis and Gas Exchange. Remember, you may use our text, our discussions, and the internet to write your answers, but be sure to write your answers in your own words and to use correct citations where appropriate! Cutting and Pasting your responses will result in a Zero for this assignment!

1. Trace the path of an oxygen molecule from the air outside you to your tissues.

| When you first take a breath, and breathe through your nose the hair in your nose can act as a filter. Any dust or dirt in the air|
|you take in can stick to your nasal hair. Once you have inhaled clean are it goes down your treachea or windpipe and into your |
|lungs. Your diaphragm is contracting causing negative pressure that forces air into your lungs. Once the Oxygen is close enough to|
|the capillaries of the lungs, it is exchanged for carbon dioxide. The oxygen then attaches to hemoglobin protein(molecules) inside |
|a red blood cell. The oxygenated blood goes to your heart and is then circulated through the body from there. |

2. Trace the path of food from ingestion to defecation. Briefly describe what happens at each stop on the journey. (See figs 14.11 and fig 14.13 in your text for some hints!)

|Digestion of food starts in the mouth. When the food enters our mouth something as small as the churning around and mucus starts |
|the process of digestion. It is part of the mechanical digestion that breaks down the food before entering your stomach. Once the |
|food leaves your mouth it travels down the Pharynx to the Esophagus swallowing Peristalsis until the food gets to the small |
|intestine for chemical digestion. This is where the food is further broke down into even smaller molecules by protein enzymes in |
|the small intestine. Water molecules are added to each bond to aid in the breakdown it is necessary to dissolve or soften the agent|
|for food digestion. Once in the small intestine absorption takes place. Carbohydrate, Protein, and Fat are all digested in the |
|small intestine. These all enter the capillary blood in the villi and are transported to the liver via the hepatic portal vein. |
|With the exception of lipids or fats, which are absorbed by the process of diffusion. Now at the end of the ileum all that remains |
|is some water, indigestible food materials and large amounts of bacteria. What is finally delivered to the large intestine contains|
|few nutrients. The colon does not produce any digestive enzymes. The bacteria that lives in the lumen metabolize some of the |
|remaining nutrients. It releases gases that contribute to the odor of feces. Absorption of the large intestines is limited to some|
|vitamins and most of the remaining water. Feces is then delivered to the rectum with just enough water to allow for a smooth |
|passage. |