the human heart beats, on average, approximately

the human heart is essentially two co-joined pumps: the one on the left pumps blood to the ____, while the one on the right pumps blood to the _____

the heart is located in the ______, just deep to the _____

The human heart is surrounded by a set of membranes collectively known as the

the outermost layer of the pericardium is

the inner layer of the pericardium is

The heart 'wall' consists of 3 layers: from the outermost to the innermost these are

the heart contains a fibrous 'skeleton', the anulus fibrosus, which consists of four interconnected fibrous rings that encircle the base of the valves: this is made of

the purpose of valves in the heart is

the valves in the heart fall into two main categories based on location/structure, which are intimately connected to the forces placed on said valves- they are the

the atrioventricular valves are anchored to the walls of the ventricles with several chordae tendinae and papillary muscles: why?

The heart valve that needs to withstand the greatest pressure is the

which chamber of the heart has the thickest wall?

The heart itself is supplied by blood vessels collectively known as

the muscle fibers in the heart are connected end to end via

the unique junctions between cardiac muscle cells allow them to

the heart has a 'pacemaker' a bundle of cells that steadily depolarize between action potentials, making them

the pacemaker of the heart, where contractile impulses originate, is in the

the heart rate is ________ by input from the sympathetic nervous system through the ________

the heart rate is ________ by input from the parasympathetic nervous system through everyone's favorite cranial nerve, #__. the ______

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