Summary: Chapter 18-Heart
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1 Chapter 18-Heart
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what are the two parts of the pericardium
the fibrous and serous pericardium -
what does the fibrous pericardium do?
loosely fitting connective tissue that protects the heart, anchors it to surrounding structures and prevents it from overfilling with blood -
what does the serous pericardium do?
thin, slippery two-layer membrane that forms sac around the heart -
what is the pericardial cavity?
serous fluid between the parietal and visceral layers that allow for frictionless environment -
anterior interventricular sulcus
marks anterior position of septum separating right and left ventricles -
what are the three veins that let blood enter the right atrium?
1) superior vena cava
2) inferior vena cava
3) coronary sinus -
cardiac pacemaker cells
have the ability to depolarize spontaneously , thus pacing the heart -
what does the negative chronotropic effect do?
parasympathetic nervous system slows the heart rate using vagus nerve -
what does the positive chronotropic effect do?
sympathetic nervous system increases heart rate due to adrenergic beta1 receptors -
what influences preload?
1) changes in position
2) intrathoracic pressure
3) blood pressure
4) muscle tone in venous wall
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