Human how much blood

When a person loses around one-fifth of their blood volume, they can go into shock. In medical terms, shock means that not enough oxygen is getting to tissues in the body. Low oxygen levels can cause damage to the brain and other organs. A deep wound or a cut on or near a vein, such as on the wrist or neck, can bleed heavily. Head wounds may also lead to significant loss. Someone who has severe bleeding will need medical attention. Immediate first response treatment is to:. If someone is bleeding profusely, the body will direct less to the skin, fingers, and toes to protect the vital organs.

A person who is losing a lot may look pale or start to feel numbness in their fingers. The heart will speed up to pump the remaining blood in the body to internal organs. Pressure usually drops as the body tries to stop blood from leaving the body. A transfusion is a medical procedure to donate to someone who needs it. Donating blood comes with a few restrictions, including if you have herpes.

Health Conditions Discover Plan Connect. Medically reviewed by Debra Sullivan, Ph. How much blood can you lose? Blood volume measurement Overview The amount of blood in the human body is generally equivalent to 7 percent of body weight. Babies: Babies born full-term have about 75 milliliters mL of blood per kilogram of their body weight. Children: The average pound child will have about 2, mL of blood in their body, or 0.

Adults: The average adult weighing to pounds should have about 1. This is about 4, to 5, mL. Pregnant women: To support their growing babies, pregnant women usually have anywhere from 30 to 50 percent more blood volume than women who are not pregnant.

This is about 0. Why and how would your doctor measure your blood volume? Read this next. Medically reviewed by Stacy Sampson, D. What Is PRP? Medically reviewed by Alana Biggers, M. Medically reviewed by Dr. When adults donate blood, health care workers take 1 pint about half a liter , Landau said. Blood cells have a life span of about days, and the body constantly makes new red blood cells in the bone marrow.

But it still takes time to regenerate these cells, so you can't donate blood every day. In adults, blood contains about 0. Vitamins, electrolytes and other nutrients are dissolved in the blood, and are carried to the body's cells and organs. For instance, gold makes up about 0. But those 40, people would yield only about 8 ounces 28 grams of gold — not enough to make anyone rich, he said.

Iron is far more plentiful in the blood.