Anatomy

• 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 the sense of smell; filters, warms, and moistens inspired are; produces sounds; and excretes some water and heat

O₂ comes into the body either through the nares then through the nasal cavity or through the mouth then through the oral cavity. Then both ways continue down the pharynx, then through the larynx , then through the trachea then through the bronchial tree (bronchi to bronchioles) then through the alveoli into the circulatory system.

External Nares

Internal Nares

• 1. Filtering, warming, and moistening incoming air
• 2. Detecting olfactory (smell) stimuli
• 3. Modifying the vibrations of speech sounds

Starts at the internal nares and extends halfway down the neck; Also known as the throat.

• 1. Passage way for air and food
• 2. Resonating chamber for speech sounds
• 3. Houses the tonsils

Piece of cartilage that prevents food or liquid from entering the larynx during swallowing

Voice box; Connects the Pharynx to the Trachea

Passageway for air; Located anterior to the esophagus

Protective covering of the lungs

Main site for gas exchange

Mucus that traps inhaled foreign particles

Serves as lubrication in the throat.

• 1. Prevents cavities from drying out
• 2. Traps particles
• 3. Provides the epithelium with Oxygen and nutrients