IB Sports, exercise and health science A.1.1.1 the Nervous System and Physiological Response Coordination Key Definitions

Receptors that monitor changes in blood pressure.

Receptors that detect changes in the chemical composition of the blood, including oxygen and carbon dioxide levels.

Homeostasis is the maintenance of a stable internal environment within an organism, ensuring optimal conditions for cellular processes.

The part of the autonomic nervous system that triggers the "rest and digest" functions.

pH is a measure of hydrogen ion (H⁺) concentration, determining how acidic or basic a solution is.

Specialized receptors that detect changes in body position and movement.

The part of the autonomic nervous system that triggers the body's "fight or flight" responses.

The narrowing of blood vessels, directing blood to vital organs during stress or physical exertion.

The widening of blood vessels, allowing more blood flow to active tissues, like muscles during exercise.

Ventilation is the process of moving air or water across the gas-exchange surface to refresh the supply of gases and maintain the concentration gradient.