Chambers Flashcards
What are the four chambers of the heart?
1) right atrium
2) right ventricle
3) left atrium
4) left ventricle
F: right atrium
F: receives venous blood from superior vena cava, inferior vena cava, and coronary sinus
Where are the pectinate muscles in the right atrium?
Lines the anterior part of the right atrium and extends into right auricle
Fossa ovalis
Remnant of the foramen ovalis that connected the right and left atrium
How does the right atrium connect to the right ventricle?
Right atrioventricular opening, guarded by the tricuspid valve
F: right ventricle
F: receives blood from the right atrium
Trabeculae carneae
i. Muscular ridges in the right ventricle and left ventricle
How many papillary muscles are there in the right ventricle?
3
F: papillary muscles
muscles that arise from the walls of the right ventricle/left ventricle and insert to the tricuspid valve to prevent blood from flowing backwards
How do the papillary muscles connect to the tricuspid/bicuspid valve?
Chordae tendineae (tendon-like structures)
Pulmonary valve
i. Prevents blood from flowing back to the right ventricle
What separates the right and left ventricle?
Interventricular septum
Where does the pulmonary artery arise?
Superior part of the right ventricle
F: left atrium
F: receives oxygenated venous blood from the right and left pulmonary veins
Where are the pectinate muscles in the left atrium?
Only found in the left auricle
How does the left atrium connect to the left ventricle?
Left atrioventricular opening, guarded by the bicuspid valve
F: left ventricle
F: receives blood from the left atrium and pumps to rest of the body
Where does the aorta arise from?
Superior part of the left ventricle
Aortic valve
Prevents blood from flowing back to the left ventricle
Where are the pectinate muscles in the heart?
a. Right atrium: anterior part and extends into right auricle
b. Left atrium: left auricle
What is the purpose of the papillary muscles?
a. Prevents semilunar valves from opening (by harnessing it so it does not flip and open
Why is the right ventricle so much thinner than the left ventricle?
i. Left ventricle needs to pump blood to rest of body (needs to be stronger)
ii. Too thick right ventricle can cause damage to the lungs if the pressure too high
iii. Right ventricle was not really used (for pumping blood) during development so not as thick compared to the left ventricle which was used on day one
