1.
alveoli: tiny sacs of lung tissue specialized for the movement of gases between air and blood
2.
bronchi: two short branches located at the lower end of the trachea that carry air into the lungs.
3.
bronchiloes: small tubes that branch to form alveoli
4.
chitin: Makes up the exoskeleton of arthropods
5.
counter-current: flow of water in the gill chamber of fish allows for respiration, water passes one way and blood flows the other
6.
diffusion: process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated
7.
gas exchange: breathing, transport of gases, and exchange of gases with tissue cells; Provides O2 for cellular respiration and removes its waste product, CO2
8.
gill: respiratory organ of aquatic animals that breathe oxygen dissolved in water
9.
gill arch: in fish, the skeletal-supporting structure of a gill
10.
gill filament: fingerlike projection from a gill where respiratory gases enter and leave the blood
11.
gill lamellae: where gas exchange occurs, with countercurrent flow between blood and water
12.
haemoglobin: a protein containing iron, found in red blood cells, which carries oxygen
13.
lung: either of two saclike respiratory organs in the chest of vertebrates
14.
permeable: allowing (especially liquids) to pass or diffuse through
15.
respiration: the metabolic processes whereby certain organisms obtain energy from organic moelcules
16.
spiracles: breathing tubes of insects located on abdomen
17.
trachea: membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi
18.
tracheal tubes: Tubes that bring gases in from the outside, in a series on each side of the body of an insect
19.
tracheoles: In insects, narrow tubes branching from trachea and making direct contact with cells to facilitate gas exchange.
20.
ventilation: the bodily process of inhalation and exhalation
