Date Section Name PRE-LAB EXERCISES Complete the following exercises prior to co

Question

Date Section Name PRE-LAB EXERCISES Complete the following exercises prior to coming to lab, using your textbook and lab manual for reference Pre-Lab Exercise 21-1 eKey Terms You should be familiar with the following terms before coming to lalb. Definition Term General Structures of the Respiratory System Respiratory tract Parietal pleura Visceral pleura Pleural cavity Lungs and lobes Structures of the Respiratory Tract Nasal cavity Pharynx Larynx Trachea Primary bronchi Secondary bronchi 510 I Exploring Anatomy & Physiology in the Laboratory

Explanation / Answer

Respiratory tract: Respiratory tract can be defined as the air passage which extends from the nose to the pulmonary alveoli essentially comprising of pharynx, larynx, trachea and bronchi.

Parietal pleura: It is the outer membrane which lines the inner surface of thoracic cavity.

Visceral pleura: It is the membrane which envelopes the surfaces of the lung.

Pleural cavity: It is the thin fluid filled space between visceral and parietal pleura of each lung.

Lungs and Lobes: Lungs are the pair of organs situated within the ribcage; consisting of sacs and passages for exchange of gases. They bring in oxygen and remove carbon dioxide from the blood. A somewhat rounded subdivison of a lung is known as lobe.

Nasal cavity: It is a large fluid filled space located above and below the nose; it is the continuation of the two nostrils.

Pharynx: It is the cavity lined by membranes leading from the cavities of the nose and mouth to the voice box and eosophagus.

Larynx:It is a muscular and carilaginous structure which is lined with mucuous membrane which forms an air passage to the lungs and holds the vocal cords in place.

Trachea: It is a large membranous tube which extends from the larynx to the bronchial tubes and passes air to and fro the lungs.

Primary bronchi: It is one of the two air passages that branch from the trachea and conveys air to the lungs.

Secondary bronchi: It is also known as lobar bronchi which delivers oxygen to the lobes of right lung.

Terminal bronchioles: It is the last portion of the non respiratory conducting airway which is further subdivded into respiratory bronchioles.

Respiratory bronchioles: They are the smallest bronchioles which connect the terminal bronchioles to alveolar ducts. The alveoli arise from the part of wall thus helping in exchange of gases.

Alveolar ducts: They are a part of repiratory passages which are located beyond repiratory bronchioles. They serve as the point of origin from which the alveoli and sacs arise.

Alveoli: They are tiny air sacs within the lungs from where exchange of gases takes place.

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