Immune cover image

Immune

Immune 73: Big macs

Nov 8, 2023
The podcast explores the total mass and number of immune cells in the human body, as well as the size and weight of organs. It discusses the differences in immune cell density between blood and organs, and analyzes the distribution and abundance of immune cells. The hosts also discuss the potential influence of Duplimumab on COVID-19 severity and delve into the role of mast cells and allergies.
01:14:32

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Quick takeaways

  • Macrophages contribute nearly 50% of the total cellular mass in the human body.
  • The lymphatic system and bone marrow have the highest number of immune cells, while blood has lower immune cell density.

Deep dives

Total number and distribution of immune cells in the human body

This podcast episode discusses a recent study that explores the total number and distribution of immune cells in the human body. The study calculates that there are approximately 37 trillion cells in the body, with 1.5 trillion of those being immune cells. Neutrophils are the most abundant immune cells, followed by T cells, B cells, and macrophages. The study also examines the density and distribution of immune cells in various organs, with the lymphatic system and bone marrow having the highest immune cell density.

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