Lecture 32- Structure and Function of Cardiomyoctes Flashcards
What is Ohm’s Law?
Delta P=Resistance x Flow
What is Poseulle’s Law?
Flow=r^4
What does Poseulle’s Law say about blood flow and radius?
Blood flow will dramatically increase if radius is increased. Even if it is a minor increase because it is to the fourth power
What are the two types of cardiomyocyte cells?
Contractile and Conductile cardiomyocyte
What is the main function of the conductile cells?
Set the rate a rhythm of the heart
What is the main type of conductile cells called?
Pacemaker cells
How do the conductile and contractile cells work together for heartbeat function?
Conductile cells (pacemaker cells) deliver electrical signals to the contractile cardiomyocyte- telling them to contract the heart
Which type of cardiomyocyte lacks a well developed set of cells?
Conductile cells
What is the main function of the contractile cells?
Generate force (contractions) to drive blood through pulmonary and systemic vasculature
Which type of cardiomyocyte has a well developed system?
Contractile cells
Includes t-tubules, SR, T-SR, DHP/Ryan Receptors
Which type of cardiomyocyte has a well developed set of cells?
Contractile cells
Includes sarcomeres, think/thick filaments, z-lines
What are the two major commonalities between the contractile and conductile cells?
- Both are uninucleate
- Both have cells that are linked at intercalated disks which have gap junctions/desmosomes
What are intercalated disks?
Areas on the ends of cardiomyoctes where they interact with other cardiomyoctes
Includes gap junctions to pass along the action potential
What are conductile cells?
Type of cardiomyocyte that conducts the acton potential through the heart to contractile cells
What must happen for contraction of a certain part of the heart to occur?
Action potential reaches the contractile cells of that part of the heart
