Venous blood in systemic circulation is poorer in oxygen and richer in carbon dioxide.
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The respiratory zone includes the respiratory bronchioles, a…
The respiratory zone includes the respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli.
Natural killers are unique phagocytic defense cells that can…
Natural killers are unique phagocytic defense cells that can kill cancer cells and virus-infected body cells well before the immune system is activated.
Memory cells are descendants of an activated B or T cell.
Memory cells are descendants of an activated B or T cell.
_____ immunity – defense against antigens and pathogenic org…
_____ immunity – defense against antigens and pathogenic organisms in body fluids
The antibody a mother passes to her fetus is IgM.
The antibody a mother passes to her fetus is IgM.
Lymphoid organs have a _____ that separates them from the su…
Lymphoid organs have a _____ that separates them from the surrounding tissues.
Exchange of both oxygen and carbon dioxide through the respi…
Exchange of both oxygen and carbon dioxide through the respiratory membrane occurs by:
Inspiration results when the diaphragm and external intercos…
Inspiration results when the diaphragm and external intercostal muscles relax.
The adaptive (specific) defense system:
The adaptive (specific) defense system: