Transport of Gases in Human Bodily Fluids
Once the oxygen diffuses across the alveoli, it enters the bloodstream and…
The Work of Breathing
The number of breaths per minute is the respiratory rate. On average, under…
The Mechanics of Human Breathing
Boyle’s Law is the gas law that states that in a closed…
Breathing
Mammalian lungs are located in the thoracic cavity where they are surrounded…
Gas Pressure and Respiration
The respiratory process can be better understood by examining the properties of…
Gas Exchange across Respiratory Surfaces
The structure of the lung maximizes its surface area to increase gas…
Lungs: Bronchi and Alveoli
The end of the trachea bifurcates (divides) to the right and left…
The Respiratory System
Figure 20.1. Lungs, which appear as nearly transparent tissue surrounding the heart…
Sliding Filament Model of Contraction
For a muscle cell to contract, the sarcomere must shorten. However, thick…
Muscle Contraction and Locomotion
Muscle cells are specialized for contraction. Muscles allow for motions such as…


