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md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com

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SOLUTIONS TO EXERCISES, LESSON 7<br />

1. Respiration is the exchange of gases between the atmosphere and the cells of the<br />

body. (para 7-1a)<br />

2. External respiration is the exchange of gases between the air in the lungs and<br />

blood. (para 7-1a)<br />

3. Internal respiration is the exchange of gases between the blood and the individual<br />

cells of the body. (para 7-1a)<br />

4. Breathing is the process that moves air into and out of the lungs. It is a<br />

mechanical process. (para 7-1b)<br />

5. In costal breathing, the major structure causing movement of the air is the rib<br />

cage. (para 7-1b)<br />

6. In diaphragmatic breathing, air movement is caused by interaction between the<br />

diaphragm and the abdominal wall. (para 7-1b)<br />

7. The <strong>com</strong>ponents of the human respiratory system consist of air passageways and<br />

two lungs. Air moves from the outside of the body into tiny sacs in the lungs called<br />

alveoli. (para 7-2a)<br />

8. The main subdivisions of the respiratory system may be identified by their relationship<br />

to the larynx (voice box). The subdivisions are as follows: supralaryngeal<br />

structures, the larynx, and infralaryngeal structures. (para 7-2b)<br />

9. The functions of the supralaryngeal structures are to cleanse, warm, moisten, and<br />

test inflowing air. (para 7-2b)<br />

10. The functions of the larynx are to control the volume of the inflowing air and to<br />

produce selected pitch (vibration frequency). (para 7-2b)<br />

11. The function of the infralaryngeal structures is to distribute air to the alveoli of the<br />

lung. Here, actual external respiration takes place. (para 7-2b)<br />

12. The external nose is supported primarily by cartilages. (para 7-3a)<br />

13. The two nasal chambers are separated by the nasal septum. The walls of the<br />

nasal chambers are lined with a membrane known as the mucoperiosteum.<br />

Scroll-like extensions, which increase the surface area of the lateral walls, are<br />

known as conchae. Sensory endings for the sense of smell are found in the<br />

olfactory epithelium. Air "cells" or cavities in the skull are known as paranasal<br />

sinuses. (para 7-3b)<br />

MD0006 7-14

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