Lecture 5 Flashcards
1
Q
What is the function of semilunar valves?
A
To prevent blood returning to ventricles during filling ( diastole)
2
Q
WHat is the name of the right semilunar valve?
A
Pulmonary
3
Q
What is the name of the left semilunar valve?
A
Aortic
4
Q
What’s are chordate tendinae?
A
Connect AV valve leaflets to the papillary muscles to ensure valve doesn’t slam too hard when it shuts
5
Q
What is the cardiac muscle cell structure?
A
- striated
- short, branched cells
- one or occasionally 2 nuclei over cell
- central oval shaped nucleus
- cytoplasmic organelles packed at the poles of nucleus
- interconnected with neighbouring cells via intercalated discs
6
Q
How can you tell the difference between cardiac and skeletal muscle cells
A
- striations
- nucleus placement
7
Q
What percent volume of cardiac muscle cells do mitochondria make up?
A
20%
8
Q
What percent volume of skeletal muscle cells do mitochondria make up?
A
2%
9
Q
What are the types of connections between cardiomyocytes?
A
- adhesion belts ( actin to actin in vertical position)
- desmosomes ( link cytokeratin with cytikeratin and prevents adhesion belts from pulling cells apart)
- ## Gap junctions ( horizontal portion for electrochemical communication)
10
Q
What are conduction cells?
A
- were cardiac muscle but no longer contract
- many more mitochondria
- lots of gap junctions
- 1% of cardiac cells
