Year 9 Blood & its component

What is the function of plasma in blood?

• Transporting nutrients and hormones

• Defending against infection

• Transporting oxygen

• Helping blood to clot

Which component of blood transports oxygen around the body?

• Platelets

• Plasma

• Red blood cells

• White blood cells

What is the main function of white blood cells?

• Transporting nutrients

• Defending against infection

• Transporting oxygen

• Helping blood to clot

What is the process carried out by phagocytes to defend the body against infection?

• Transporting nutrients

• Blood clotting

• Phagocytosis

• Antibody production

What is the role of platelets in blood clotting?

• Forming scabs

• Releasing digestive enzymes

• Transporting oxygen

• Defending against infection

What do lymphocytes produce to destroy pathogenic cells?

• Antibodies

• Antitoxins

• Hormones

• Digestive enzymes

What happens when the skin is broken and platelets arrive to stop the bleeding?

• Red blood cells form a clot

• Platelets release chemicals

• Soluble fibrinogen proteins convert into insoluble fibrin

• Insoluble mesh forms across the wound

What is the purpose of scab formation in the wound healing process?

• Transporting nutrients

• Defending against infection

• Preventing entry of microorganisms

• Preventing blood loss

How do phagocytes detect pathogenic cells?

• By engulfing them

• By releasing digestive enzymes

• By detecting chemicals produced by pathogenic cells

• By forming scabs

What is the final stage in the blood clotting process?

• Insoluble mesh forms across the wound

• Red blood cells form a clot

• Platelets release chemicals

• Clot eventually dries and develops into a scab