The Wikipedia page on Arteries provides an in-depth overview of the major blood vessels in the human body that carry oxygenated blood from the heart to the various organs and tissues.

Bacteria are single-celled microorganisms that have a wide range of shapes and sizes.

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system.

Hemoglobin is a protein found in red blood cells that is responsible for carrying oxygen from the lungs to the tissues and organs of the body.

The Wikipedia page for "Lung" provides comprehensive information about this vital organ of the respiratory system.

The Wikipedia page on medicine provides an overview of the field of medicine, covering various aspects such as its history, branches, education, research, practice, and ethics.

Oxygen is a chemical element with the symbol O and atomic number 8.

An oxygen sensor (or lambda sensor, where lambda refers to air-fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analysed.