Understanding the Human Circulatory System

Why do larger organisms require a circulatory system?

• To produce more cells

• To increase their surface area

• To decrease their volume

• To transport essential molecules throughout the body

What is the primary function of red blood cells?

• To carry oxygen around the body

• To transport nutrients

• To fight infections

• To produce antibodies

What is the role of phagocytes in the immune system?

• To produce antibodies

• To engulf and digest pathogens

• To transport oxygen

• To form blood clots

How do lymphocytes contribute to immunity?

• By forming blood clots

• By carrying oxygen

• By transporting nutrients

• By producing antibodies

What is the purpose of immunological memory cells?

• To form blood clots

• To produce more red blood cells

• To transport oxygen

• To remember past infections and respond quickly

How do vaccinations help in disease prevention?

• By reducing the body's surface area

• By forming blood clots

• By teaching the body to produce antibodies against specific pathogens

• By increasing the number of red blood cells

What is the main function of platelets in the blood?

• To produce antibodies

• To transport oxygen

• To fight infections

• To form blood clots

What percentage of plasma is water?

• 50%

• 70%

• 90%

• 100%

Which of the following is NOT transported by plasma?

• Oxygen

• Amino acids

• Glucose

• Hormones

What role does plasma play in temperature regulation?

• It distributes heat around the body

• It forms blood clots

• It produces antibodies

• It carries oxygen