The Human Body Week 8

502 Words3 Pages
1. Why do foreign objects that enter the trachea usually lodge in the right main bronchus? A. The trachea terminates in the chest and divides into the right main bronchus. The right bronchus is shorter, wider and more vertical than the left bronchus. Because of this if a foreign object such as food gets into the trachea it will get lodged in the right main bronchus. (Rizzo, 410). 2. What are three methods of carbon dioxide transport within the blood? A. Ventilation – the movement of air between the lungs and atmosphere External Respiration – exchange of gas between the lungs and blood Internal Respiration – exchange of gas between the blood and body cells. (Rizzo, 413). 3. Briefly describe the difference between a peristaltic movement of food and movement by segmentation. A. Peristaltic movement of food is the pushing of food along the digestive tract. The segmentation movement of food refers to little movement and is related to the small intestine. The small intestine has stationary contraction and relaxation. Chyme makes contact with the small intestinal wall and moves slowly towards the large intestine. Once most of the food is absorbed the peristaltic activity physically pushes the remaining food and materials to the large intestine. 4. What vital functions of the kidneys are performed by the nephrons? A. The nephrons function as a filter and vascular components in the kidney. The nephron begins as Bowman’s glomerular capsule which works with the enclosed glomerulus to make a renal corpuscle. The viscelar layer of the Bowman’s capsule and the endothelial capillary network of the glomerulus come together and form an endothelial-capsular membrane. This is where filtration of water and blood solutes occurs. Collecting ducts connect with distal tubules of nephrons in the medulla to help collecting ducts
Open Document