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Layers of the heart - ...(CORRECT ANSWER). pericardium
myocardium
endocardium
pericardium - ...(CORRECT ANSWER) outermost layer: fibrous and serous
fibrous
-outer sack that anchors the heart
serous
-inner, fluid secreting membrane with two layers
-parietal (lines inner surface of fibrous sac)
-visceral (AKA epicardium) lines myocardium
-between the two is the pericardial space, with 10-30ml of fluid to give the heart
space to relax and contract
myocardium - ...(CORRECT ANSWER). i. Thick, middle muscular layer that
makes up the
bulk of the heart wall
,ii. Composed of cardiac muscle cells and is responsible for the heart's ability to
contract
endocardium - ...(CORRECT ANSWER). i. Thin layer of tissue that lines the
inner surface of
heart muscle and heart chambers
ii. Extensions and folds of this tissue forms the valves of the heart.
4 primary characteristics of the heart - ...(CORRECT ANSWER). automaticity
excitability
conductivity
contractility
automaticity - ...(CORRECT ANSWER). i. Specific to the pacemaker cells;
ability to
generate their own electrical impulse spontaneously
excitability - ...(CORRECT ANSWER) Ability of ALL cardiac cells to respond
to an electrical
impulse
conductivity - ...(CORRECT ANSWER) i. Ability of ALL cardiac cells to
conduct an electrical
impulse
contractility - ...(CORRECT ANSWER) i. Specific to muscle cells; ability to
, cause cardiac
muscle contraction