A vampire is headed straight for you. "I vant to drink your blood," he hisses. To prevent him from sucking the life force straight out of you, you decide to distract him with your amazing knowledge of blood. Take the quiz and prove yourself.
Question 1 of 20
How many liters of blood does the adult human body contain?
... The adult human body contains approximately 5 liters, or 5.3 quarts, of blood. That makes up 7 to 8 percent of a person's body weight.
Question 2 of 20
How long does a red blood cell survive in the bloodstream?
... Red blood cells last an average of 120 days in the bloodstream. As these cells age, they're removed by microphages in the liver and spleen.
Question 3 of 20
What is hemoglobin?
... Hemoglobin is a protein that carries the oxygen throughout the body.
Question 4 of 20
What is a hematocrit?
... The percentage of blood made up of red blood cells is a frequently measured number known as the hematocrit. The ratio of cells in normal blood is 600 red blood cells for each white blood cell and 40 platelets.
Question 5 of 20
How does blood get its red color?
... The iron in hemoglobin gives blood its red color. Each molecule of hemoglobin contains four iron atoms, and each iron atom can bind with one molecule of oxygen.
Question 6 of 20
What is the function of white blood cells?
... White blood cells help to fight infection.
Question 7 of 20
What does it mean when there's an increase of white blood cells in the body?
... When the number of white blood cells in a person's blood increases, this is a sign of an infection somewhere in the body. In a normal adult body there are 4,000 to 10,000 white blood cells per microliter of blood.
Question 8 of 20
There are six main types of white blood cells in the blood. Which type is the most common?
... Neutrophils, which kill bacteria by ingesting them, make up 58 percent of a person's white blood cell count. The other five main types of white blood cells are eosinophils, basophils, bands, monocytes and lymphocytes.
Question 9 of 20
What substance makes up the majority of plasma?
... Plasma is 90 percent water. The other 10 percent dissolved into plasma are materials such as proteins, electrolytes, carbohydrates, cholesterol, hormones and vitamins.
Question 10 of 20
If you are a universal donor, what blood type do you have?
... People with type O blood are universal donors, because anyone can get a type O blood transfusion. Type O blood has no antigen on the surface that could react with antibodies in the recipient's plasma, which causes a transfusion reaction. Someone with type AB blood is a universal recipient because this blood has no antibodies that could react with donated blood.
Question 11 of 20
What are the two components that make up blood?
... Blood is a mixture of cells and plasma.
Question 12 of 20
What is the function of platelets in the blood?
... Platelets are used for clotting.
Question 13 of 20
Where are blood cells produced?
... All blood cells are produced in the bone marrow.
Question 14 of 20
What is hematopoiesis?
... When the body produces blood, it is called hematopoiesis.
Question 15 of 20
Which of the following helps to remove carbon dioxide (CO2) from the body?
... Carbon dioxide is formed in red blood cells. It enters the blood and is brought to the lungs to be released as we breathe.
Question 16 of 20
What is the name of the leftover fluid when plasma is clotted?
... When plasma is allowed to clot, the fluid left behind is called serum.
Question 17 of 20
What type of blood has both A and B antigens?
... When both A and B antigens are present, you have type AB blood.
Question 18 of 20
How often can you donate blood?
... Blood can be donated every eight weeks.
Question 19 of 20
What is apheresis?
... Apherisis is the procedure used when it is necessary to remove a specific component of a donor’s blood.
Question 20 of 20
Red blood cells make up what percentage of the elements in blood?
... Red blood cells make up more than 90 percent of the elements in the blood.
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