6.3a MHS IB Bio Immune System

The body's primary defense against pathogens includes

• platelets

• skin and mucus membranes

• Helper T-cells

• phagocytic leukocytes

Which is NOT a property of mucus membranes that help to prevent infection?

• pH unfavorable to pathogens

• lysozymes break down pathogens

• competitive exclusion by non-harmful microbes

• dry and therefore inhospitable to pathogens

__________ release clotting factors in response to a wound.

• Red blood cells

• Platelets

• White blood cells

• Leukocytes

Thrombin is an enzyme that catalyzes the reaction that converts

• fibrinogen to fibrin.

• fibrin to clotting factors.

• clotting factors to erythrocytes.

• platelets to fibrinogen.

A build up of cholesterol causes the artery lumen to

• narrow.

• widen.

• stay the same.

A heart attack is also known as a

• myocardial infarction.

• myocardial infraction.

• myocardial incident.

• myocardial incineration.

Risk factors for Coronary Heart Disease include (check all that apply):

• genetic factors

• age

• stress

• exercise

• diet

State the first line of defense if a pathogen enters the body.

• phagocytic leukocytes

• fibrinogen

• coronary thrombosis

• prokaryotic bacteria

Movement in response to chemicals, such as that displayed by a white blood cell seeking to engulf a pathogen, is known as

• chemotaxis.

• parthenogenesis.

• endocytosis.

• phagosomes.

The vesicle that forms following endocytosis of a pathogen by a phagocytic leukocyte is known as a

• phagosome.

• lysosome.

• chemotaxis.

• mucus membrane.