Physiology

What is the approximate percentage of plasma in blood?

• 37%

• 60%

• 25%

• 54%

What is the hematocrit used to measure?

• The percentage of plasma in blood

• The percentage of white blood cells in blood

• The percentage of red blood cells in blood

• The percentage of platelets in blood

What could a high hematocrit indicate?

• Dehydration

• Vitamin deficiency

• Artificial production of red blood cells

• Low oxygen levels

What is the primary function of red blood cells?

• To fight infections

• To clot blood

• To carry oxygen

• To repair damaged tissues

What percentage of cells produced by the bone marrow are red blood cells?

• 75%

• 37%

• 25%

• 60%

What triggers the body to produce more red blood cells?

• High altitude

• Increased water intake

• Exposure to sunlight

• Exercise

What is the lifespan of red blood cells?

• A few hours or days

• Approximately four months

• Indefinite

• One year

What is the role of platelets in the blood?

• To fight infections

• To produce antibodies

• To carry oxygen

• To clot blood

What is the final enzyme produced in the coagulation cascade?

• Prothrombin

• Thrombin

• Fibrin

• Collagen

What vitamin is essential for the production of coagulation factors?

• Vitamin B12

• Vitamin D

• Vitamin C

• Vitamin K