A&P II Notes Feb 20

Neutrophils most abundant wbcs granulocytes become

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Neutrophils – most abundant WBCs, granulocytes, become macrophages  (cells involved in phagocytosis) – engulf infectious agents and foreign  objects Lymphocytes – agranulocytes, cells that are involved in specific defenses  (immunity), two major sub-categories: T and B cells Heart o Coronary circulation – heart pumps blood inside its chambers but heart muscle itself  needs to be nourished (needs to have its own blood supply Cardiovascular disease – often affects heart’s blood supply, leads to a heart attack  because of physical blockages o Wall of the left ventricle is much thicker than the right ventricle – cardiac muscle tissue,  has to push the blood farther so it must be stronger (right only has to push blood nearby  to the lungs), left ventricle has to create high pressure so the blood goes throughout the  body – the wall needs to resist this pressure o Contraction – contraction of the ventricles and not the atria Myocardial cells – have the ability to depolarize, contract on their own (without  neural input) – but to their own rhythm, conduction system allows them to beat in  rhythm o
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