Rising carbon dioxide levels are being detected within the human body, with new research warning a key blood marker for the gas could near its healthy limit within decades if current trends continue.

Humans evolved in an atmosphere containing roughly 200–300 parts per million (ppm) of carbon dioxide (CO₂). Today, that ...

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body. Water ...

Our blood consists of many cell types that develop through different stages from a precursor type -- the blood stem cell. An international research team has now investigated the developmental pathways ...

With each heartbeat, blood courses through your body. Some traverse arteries from the lungs back to the heart, and some navigate through capillaries in the thinnest layers of your eyelid, almost ...

In a recent study published in the journal PNAS, researchers examined the relationship between cell size and count across the human body, establishing a quantitative framework and uncovering ...

Having excess body weight can increase your blood pressure and affect your immune system. Learn what happens to blood pressure and your immune system when you lose body fat.

A new study suggests rising carbon-dioxide levels may be slowly changing human blood chemistry and could impact long term ...