Uploaded by John Philip Napal

Respiratory System Handout

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Biology Lesson 7
RESPIRATORY SYSTEM
–
functions for mechanical respiration
(external and internal respiration)
–
provides a conducting system for
exchange of gases, filters incoming
particles
–
helps control water and temperature and
assists in speech production, sense of
smell and regulation of blood pH
–
divided into an upper and lower
respiratory tract
The Passageway of Air
Types of Respiration:
1. Cellular Respiration – oxidative process that occurs within cells
2. External Respiration – the exchange of gases between the organism and
environment
The Human Respiratory System
Upper respiratory tract: nostrils – nasal cavity – sinuses – nasopharynx
Lower respiratory tract: larynx – trachea – lungs – alveoli
Muscles involved in breathing:
§ Diaphragm – main muscle that causes expansion of the thoracic cavity; separates
the thoracic cavity and abdominal cavity
§ Intercostal muscles – muscles between the ribs
Control of Breathing
Breathing is controlled by the respiratory center in the medulla of the brain stem; the
rate of breathing is influenced by the level of O2 but more importantly by high levels of
CO 2 or low blood pH.
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