bio 1020 unit 6 vocab

Alveoli

Tiny thin-walled air sacs at the ends of bronchioles in the lungs, surrounded by capillaries.

Bronchi

Tubes branching from the trachea that carry air into each lung.

Bronchioles

Tubes from the bronchi that lead to clusters of alveoli.

Diaphragm

Large muscle at the floor of the chest cavity; contraction of this muscle expands the chest cavity and draws air into the lungs.

Ectotherm

Organism whose body temperature is determined primarily by the temperature of their environment.

Embryo

Developing organism; 'baby' plant or animal.

Endosperm

Food source for developing plant embryo.

Endotherm

Organism whose body temperature is maintained independent of environmental temperature, usually at a metabolically optimal level.

Epiglottis

Flap at the top of the trachea that prevents food from entering or blocking the pathway of air to the lungs.

Metabolism

The collection of chemical reactions that occur in organisms.

Spiracle

Opening in insect body wall through which air enters tracheae.

Thermal strategy

Metabolic patterns of organisms.

Trachea

Air tube leading from the back of the mouth down into the chest cavity; the 'windpipe'.

Tracheae

Tiny tubes in insect body that deliver oxygen directly to metabolizing cells and tissues.