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en.wikipedia.org/wiki/Blood_cell

Red blood cells or erythrocytes, primarily carry oxygen and collect carbon dioxide through the use of haemoglobin.Haemoglobin is an iron-containing protein that gives red blood cells their color and facilitates transportation of oxygen from the lungs to tissues and carbon dioxide from tissues to the lungs to be exhaled. Red blood cells are the most abundant cell in the blood, accounting for ...

www.webmd.com/heart/anatomy-picture-of-blood

Blood is a constantly circulating fluid providing the body with nutrition, oxygen, and waste removal. Blood is mostly liquid, with numerous cells and proteins suspended in it, making blood ...

www.ncbi.nlm.nih.gov/books/NBK2263

The average human adult has more than 5 liters (6 quarts) of blood in his or her body. Blood carries oxygen and nutrients to living cells and takes away their waste products. It also delivers immune cells to fight infections and contains platelets that can form a plug in a damaged blood vessel to prevent blood loss.

www.healthline.com/health/blood-cell-disorders

A blood cell disorder is a condition in which there’s a problem with your red blood cells, white blood cells, or the smaller circulating cells called platelets, which are critical for clot ...

www.hematology.org/Patients/Basics

Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.

www.thoughtco.com/red-blood-cells-373487

A red blood cell has what is known as a biconcave shape. Both sides of the cell's surface curve inward like the interior of a sphere. This shape aids in a red blood cell's ability to maneuver through tiny blood vessels to deliver oxygen to organs and tissues.

microbiologyinfo.com/blood-cells-types-functions

Blood cells are the cells which are produced during hematopoiesis and found mainly in the blood. Blood is composed of the blood cells which accounts for 45% of the blood tissue by volume, with the remaining 55% of the volume composed of plasma, the liquid portion of the blood.

www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=160&ContentID=34

Most people don't think about their red blood cells unless they have a disease that affects these cells. Problems with red blood cells can be caused by illnesses or a lack of iron or vitamins in your diet. Some diseases of the red blood cells are inherited. Diseases of the red blood cells include ...

www.britannica.com/science/red-blood-cell

Red blood cell, also called erythrocyte, cellular component of blood, millions of which in the circulation of vertebrates give the blood its characteristic colour and carry oxygen from the lungs to the tissues. The mature human red blood cell is small, round, and biconcave; it appears dumbbell-shaped in profile. The cell is flexible and assumes a bell shape as it passes through extremely small ...

www.mayoclinic.org/symptoms/high-red-blood-cell-count/basics/causes/sym-20050858

High red blood cell count may be caused by low oxygen levels, kidney disease or other problems. Low oxygen levels. Your body may increase red blood cell production to compensate for any condition that results in low oxygen levels, including: