write the role of following a)Gastric sphincter b) diaphragm c) epiglottis d) 'C' shape cartilage ring in wind pipe e) haemoglobin f) valve in the vein
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Answer:
A) Gastric Sphincter - The gastric sphincter serves as a kind of gateway between the stomach and the small intestine. It controls the release of food from the stomach to small intestine. It also prevents partially digested food and digestive juices from re-entering the stomach
B) Diaphragm - The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges.
C) Epiglottis - When a person swallows the epiglottis folds backward to cover the entrance of the larynx so food and liquid do not enter the windpipe and lungs. After swallowing the epiglottis returns to its original upright position.
D) 'C' shape cartilage ring in wind pipe - A normal trachea (windpipe) has many rings made of cartilage (a strong and flexible tissue). These rings are C-shaped and support the trachea but also allow it to move and flex when your child breathes.
E) Haemoglobin - Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues. Myoglobin, in muscle cells, accepts, stores, transports and releases oxygen.
F) Valve in the veins - The deep veins play a significant role in propelling blood toward the heart. The one-way valves in deep veins prevent blood from flowing backward, and the muscles surrounding the deep veins compress them, helping force the blood toward the heart, just as squeezing a toothpaste tube ejects toothpaste.
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