Wiley Ch. 23.1

The respiratory zone consists of tubes and tissues within the lungs where

gas exchange occurs.

function of the conducting zone

is to filter, warm, and moisten air and conduct it into the lungs.

Which structures are part of the conducting zone of the respiratory system?

nose, nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, and terminal bronchioles;

Internal (tissue) respiration is

the exchange of gases between blood in systemic capillaries and tissue cells. In this step the blood loses O2 and gains CO2. Within cells, the metabolic reactions that consume O2 and give off CO2 during the production of ATP are termed cellular respiration

External (pulmonary) respiration is

the exchange of gases between the alveoli of the lungs and the blood in pulmonary capillaries across the respiratory membrane. In this process, pulmonary capillary blood gains O2 and loses CO2.

Pulmonary ventilation (pulmon- = lung), or breathing, is

the inhalation (inflow) and exhalation (outflow) of air and involves the exchange of air between the atmosphere and the alveoli of the lungs. Inhalation permits O2 to enter the lungs and exhalation permits CO2 to leave the lungs.

conducting zone consists of a series of interconnecting cavities and

tubes both outside and within the lungs.

Functions of the respiratory system

1.Provides for gas exchange: intake of O2 for delivery to body cells and removal of CO2 produced by body cells. 2.Helps regulate blood pH. 3.Contains receptors for sense of smell, filters inspired air, produces vocal sounds (phonation), and excretes small amounts of water and heat.

How does external respiration differ from internal respiration?

External respiration involves the exchange of O2 and CO2 between the alveoli of the lungs and the blood in pulmonary capillaries; internal respiration involves the exchange of O2 and CO2 between the blood in systemic capillaries and tissue cells of the body.

Where does the main site of gas exchange occur?

Respitory zone

The respitory zone includes the

respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli