Physiology

For the vast majority of animals, an organism's metabolic rate scales to the $\frac{3}{4}$ power of the animal's mass.

Living systems maintain a stable internal environment despite changes in external conditions.

The stroke volume of the heart increases in response to an increase in the volume of blood in the ventricles, before contraction, when all other factors remain constant.

Hemoglobin's oxygen binding affinity is inversely related both to acidity and to the concentration of carbon dioxide.

Deoxygenated blood increases its ability to carry carbon dioxide.

A neural pathway that controls a reflex, generally involving a receptor, sensory neuron, interneuron, motor neuron, and effector.

The strength of the heart's systolic contraction is directly proportional to its diastolic expansion with the result that under normal physiological conditions the heart pumps out of the right atrium all the blood returned to it without letting any back up in the veins.

An extreme Bohr effect present in some fish where an increase in acidity or carbon dioxide lowers the oxygen carrying capacity of hemoglobin, not just the affinity.