cells and systems

2. a muscle situated between the ribs.
6. happens when air or other gases enter the lungs.
10. the metabolic process in living organisms by which oxygen is combined with carbon in a cell to form carbon dioxide and generate energy.
13. is the part of the throat behind the mouth and nasal cavity, and above the oesophagus and trachea.
14. also known as the windpipe is a cartilaginous tube that connects the larynx to the bronchi of the lungs.
15. are the primary organs of the respiratory system in humans and most other animals, including some snails and a small number of fish
16. is the flow of the breath out of an organism.

1. is a resilient and smooth type of connective tissue.
3. is a leaf-shaped flap in the throat that prevents food and water from entering the windpipe and the lungs.
4. commonly called the voice box, is an organ in the top of the neck involved in breathing, producing sound and protecting the trachea against food aspiration
5. also known as vocal folds or voice reeds, are folds of throat tissues that are key in creating sounds through vocalization.
7. or bronchioli are the smaller branches of the bronchial airways in the lower respiratory tract.
8. is a passage or airway in the lower respiratory tract that conducts air into the lungs.
9. is the net movement of anything generally from a region of higher concentration to a region of lower concentration.
11. also known as an air sac or air space,
12. is the iron-containing oxygen-transport metalloprotein in red blood cells