Question

With reference to the blood in a normal person, which one of the following statements is correct?

• A. Compared to arteries, veins are less numerous and hold less of the body's blood at any given time.
• B. Blood cells constitute about 70 percent of the total volume of the blood.
• C. White blood cells (WBC) are made by lymph nodes only.
• D. The blood has more platelets than WBC.

Answer 1

Answer: (D)

The blood has more platelets than WBC.

Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells and platelets. The blood has more platelets than WBC. A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. An average normal range for white blood cells is between 4,500 and 10,000 /mcl.

Blood has many different functions. They are as follows:

• Transporting oxygen and nutrients to the lungs and tissues.
  
• Forming blood clots to prevent excess blood loss.
  
• Carrying cells and antibodies that fight infection.
  
• Bringing waste products to the kidneys and liver, which filter and clean the blood.
  
• Regulating body temperature.