Cardiovascular System Mod 10 Flashcards
Where is the heart located?
In the mediastinum under the second rib
What are the 3 layers of the heart and what is their function?
- Endocardium: lines the inside of the heart
- Myocardium: thickest layer and is hearts muscle layer
- Thin outermost layer
What is the pericardium and what are the 3 layers?
A sac that encloses the heart and keeps it in place
Parietal layer
Pericardial layer
Visceral layer (epicardium)
What are the 2 divisions of the heart and what are their functions?
- Pulmonary circuit: right side pumps blood low in oxygen to the lungs
- Systemic circuit: left side pumps oxygenated blood to the body
What are the 2 chambers of the heart and their functions?
2 upper chambers: LEFT AND RIGHT ATRIA which are receiving chambers
2 lower chambers: RIGHT AND LEFT VENTRICLES which are discharging chambers
What are the 4 valves of the heart and their functions?
Keep blood flowing through the heart and prevent back flow
Atrioventricular valves: LEFT (BICUSPID) AND RIGHT (TRICUSPID) entrance valves
Semilunar valves: PULMONARY VALVE (DEOXYGENATED BLOOD LEAVING THE VENTRICLE) AORTIC VALVE (OXYGENATED BLOOD LEAVING THE VENTRICLE)
What is stroke volume?
Volume of blood that is ejected from one ventricle with each beat
What is cardiac output?
Amount of blood that one ventricle can pump each minute
What is a sinoatrial node (SA)?
The hearts natural pace maker located in the right atrium near the opening of the superior vena cava
What is a atrioventricular node (AV)?
Located in the right atrium close to the ventricle
What is an AV bundle (bundle of His)?
Located in the septum of the ventricle
What are purkinje fibres?
Located in the walls of the ventricles
What are arteries?
A blood vessel that pushes blood away from the heart
What are arterioles?
A blood vessel that pushes blood into capillaries
What are capillaries?
A blood vessel that are tiny and thin walled that allows gas and nutrient exchange
What are venules?
Blood vessels that receive blood from capillaries and then go back to the heart
What are veins?
Blood vessel that transports blood to the heart
What are the 3 tunics that arteries and veins have and what are their functions?
- Tunica intima: inner coat that is smooth and allows blood to flow easily
- Tunica media: middle smooth muscle that is the thickest layer that allows it to stretch
- Tunica externa: outer layer that is connective tissue