Blood
This blood type is the universal donor
Type O
The inner layer of a blood vessel
Tunica intima
First line of defense against pathogens
Skin and mucous membranes
Cells that produce antibodies
B cells (plasma cells)
Main function of the respiratory system
Gas exchange
This blood type has no antibodies and is the universal recipient.
Type AB
This layer controls vasoconstriction and vasodilation
Tunica Media
Cells that engulf pathogens
Phagocytosis (macrophages/neutrophils)
Cells that coordinate immune response
Helper T cells (CD4+)
Structure that prevents food from entering airway
Epiglottis
This process causes clumping of RBCs during incompatible transfusions
Agglutination
These vessels have valves and act as a blood reservoir
Veins
Cells that kill infected cells using perforin and granzymes
Natural killer (NK) cells
Cells that kill infected cells directly
Cytotoxic T cells (CD8+)
Site of gas exchange in lungs
Alveoli
This Rh group can receive both positive and negative blood
Rh positive
These vessels are one cell thick and allow gas exchange
Capillaries
Chemical released during inflammation that causes vasodilation
Histamine
These molecules present antigens to T cells
MHC molecules
This part of the respiratory system includes the trachea, bronchi, and bronchioles and is responsible for moving air but not gas exchange
Conducting Zone
This liquid portion of blood is mostly water and carries proteins and nutrients
Plasma
This mechanism narrows vessels and increases blood pressure
Vasoconstriction
This response raises body temperature to fight infection
Fever
This type of immunity involves antibodies and defends against pathogens in body fluids
Humoral Immunity
Cells that produce surfactant
Type II alveolar cells