click below
click below
Normal Size Small Size show me how
med-surgical cardio
chapter 18
Question | Answer |
---|---|
What does the heart consist of? | endocardium myocardium epicardium |
What surrounds the heart? | pericardium |
What does the pericardium space contain? | fluid of 5-20ml |
What does the pericardium provide? | barrier to infection, prevents displacement of the heart, pain and other receptors that reflex the changes in heart rate and blood pressure |
What is the pericardium? | double-membranous sac |
How many chambers are in the heart? | four chambers; right atrium, left atrium, right ventricle, left ventricle |
What does it make up? | two coordinated pumps for left and right |
What is the right side of the heart for? | low-pressure system |
What is the left side of the heart for? | high-pressure system |
What does the right atrium and right ventricle receive and where does it go? | deoxygenated blood; goes to the lungs |
What does the left atrium and left ventricle receive and where does it go? | oxygenated blood; goes through the systemic circulation |
What separates the right and left sides | septum |
What directs the flow of blood through the heart chambers? | cardiac valves |
How does blood enter the right atrium? | superior and inferior vena cava |
Where does the blood go after superior and inferior vena cava? | right atrium |
When the blood leaves the right atrium where does it go and where does it circulate to? | right ventricle and circulates to the lungs |
Once blood circulates in the lungs, what is exchanged? | carbon dioxide |
What does the other arteries in the body carry? | oxygenated blood |
Where does the left atrium receive blood? | pulmonary veins |
What does other veins carry in the blood? | carbon dioxide |
Where does the left ventricle ejects from carrying blood from the body? | aortic valve |
What supplies the cardiac muscle with blood? | coronary arteries |
What does the left coronary artery divide and cicumflex? | anterior descending; providing blood for the left side |
What does the right coronary arteries provides? | blood for the right atrium, right ventricle, posterior wall of left ventricle |
Where is the heart located? | within the mediastinum, tilted forward to the left side of the chest |
Where can the point of maximal (PMI) impulse be found? | fifth and sixth ribs on the dividing of the left clavicle in half |
How is the heart pumping action sparked? | special pacemaker cells and conduction fibers |
Where is the conduction pathway located? | myocardium |
Where is the SA node located? | right atrium |
What is another name for SA node and why> | pacemaker, because its the initiates the electrical impulses |
Where is the AV node located? | bottom of right atrium |
What does it relay and where does it relay to? | impulses from SA node, bundle of his, and to the purkinje fibers |
What is influence by autonomic nervous system? | heart rate and rhythm |
What are the factors affecting the ANS? | speed up or slow down the heart rate |
What does the cardiac cycle consist of? | contractions of the muscle and relaxation of the muscle |
What is the amount of cardiac output and the amount of blood returning? | depends on the heart rate; 5liters |
What is ejection fraction and what is the percentage? | percentage of blood ejected out from the heart during systole |
What happens as ejection fraction decreases? | heart failure; tissue perfusion diminishes |
What can cause pulmonary edema? | too much blood and the increased pressure in the pulmonary vessels |
What does stroke volume mean? | the amount of blood ejected by a ventricle during contraction |
What is cardiac output? | stroke volume multiplied by the heart rate |
What are the three types of blood vessels that make up the vascular system? | arteries, veins, and capillaries |
What is the function of the blood vessels? | conduct the blood from the body tissues to the heart and from the heart back to the tissues |