BIO 215 Lecture 8: lecture 8 chap 23
Document Summary
Cells continually use o2 and release co2. Failure of either system: rapid cell death from o2 starvation. ^upper respiratory tract is above vocal cords. ^lower respiratory tract is below vocal cords. Functions of the nasal structures: large chambers within the skull roof is made up of ethmoid and floor is hard palate nasal septum is composed of bone and cartilage exam question: 1. 12-1. 17 (bolded info) Pseudostratified ciliated columnar with goblet cells lines nasal cavity: warms air due to high vascularity, mucous moistens air and traps dust (cleanse, cilia moves mucous toward pharynx. Paranasal sinuses open into nasal cavity: found in ethmoid =, sphenoid, frontal and maxillary, lighten skull and resonate voice. Muscular tube (13cm- 5-inch-long) hanging from the skull: skeletal muscle and mucous membrane. Extends from the internal nares to cricoid cartilage. Functions: passageway for food and air, resonating chamber for speech production, tonsil (lymphatic tissue) in the walls protects entryway into body.
