Lecture 5 Flashcards
identify the vessels of cardiac circulation = aorta to coronary arteries (left and right)
- aorta supplies both the left and right coronary arteries
- left then supplies the circumflex artery and anterior inter-ventricular artery
- right supplies the right ventricle and small branches supply the right atrium
identify the vessels of cardiac circulation = cardiac veins
- small cardiac vein = drains the territories of the right coronary artery
- great cardiac vein = drains the territories supplied by the anterior inter-ventricular artery and the circumflex artery (left coronary supply)
what is the coronary sinus and its function?
where both cardiac veins drain to, which then takes the blood to the right atrium
compare the nuclei in skeletal muscle and cardiac muscle
cardiac muscle = centre of the cell
skeletal muscle = on the periphery of the cell
compare the branched striations of cardiac and skeletal muscle
cardiac = striated and short branched cells
skeletal = striated and longer cells
compare the mitochondria of cardiac and skeletal muscle
cardiac = many mitochondria - 20% volume of cell
skeletal = not as many mitochondria - 2% of cell volume
compare the sarcomeres of cardiac and skeletal muscle
cardiac = irregular branched sarcomeres
skeletal = uniform
what are the 3 intercalated discs found in cardiac muscle?
adhesion belts, desmosomes and gap junctions
what are adhesion belts?
link actin to actin = transmits force into neighbouring cell
what are desmosomes?
keep the cell buttoned together when sarcomeres shorten, so they don’t rip apart
what are gap junctions?
two phospholipid layers fuse together = allows electrochemical communication and release of calcium stores
what are conduction cells in cardiac muscle?
bloated non contractile cardiac muscle involved with electrical conduction
