Question

Which of the following statements is true concerning human blood?
1. The blood of all normal humans contains red and white cells, platelets, and plasma.
2. Some human populations normally lack the ability to produce plasma.
3. Proteins are not normal components of human blood.
4. none of the above

Answer 1

Correct Answer - Option 1 : The blood of all normal humans contains red and white cells, platelets, and plasma.

Explanation:

• Blood is a special connective tissue consisting of a fluid matrix, plasma, and formed elements
• Plasma is a straw-colored, viscous fluid constituting nearly 55 percent of the blood. 90-92 percent of plasma is water and proteins contribute 6-8 percent of it.
• Fibrinogen, globulins and albumins are the major proteins
• Erythrocytes or Red blood cells, leukocytes or White blood cells, and platelets or thrombocytes are collectively called formed elements and they constitute nearly 45 percent of the blood.

So, the true statement about blood is ''The blood of all normal humans contains red and white cells, platelets, and plasma''.

 

Blood Components	Characters
Erythrocytes	These are the most abundant of all the cells in the blood.  A healthy adult man has, on average, 5 million to 5.5 million RBCs mm–3 of blood.
Leucocytes	These are also known as white blood cells (WBC) as they are colorless due to the lack of hemoglobin. They are nucleated and are relatively lesser in number which averages 6000-8000 mm–3 of blood.
Platelets	These also called thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow). Blood normally contains 200,000-300,000 platelets mm–3.
Blood Proteins	Fibrinogens are needed for clotting or coagulation of blood. Globulins primarily are involved in defense mechanisms of the body The albumins help in osmotic balance.