Case 4 Flashcards
What does the right side of the heart pump blood to
The lungs
What does the left side of the heart pump blood to
Peripheral organs
What is a stronger pump atrium or the ventricles
VENTRICLES
What are the three major types of cardiac muscle
Atrial
Ventricular
Specialised excitatory and conductive muscle fibres
What is the difference and similarities in atrial/ventricular and skeletal muscle
It contracts strongly in a similar way to skeletal muscle however duration is longer than that of skeletal muscles
How do specialised excitatory and conductive muscle fibres contract
Weakly because they contain few contractile fibrils
What muscles provide the excitatory system that controls the rhythmical beating of the heart
Specialised excitatory and conductive muscle fibres
What is a cardiac muscle cell
Cardiomyocyte
What is an intercalated disc
Cell membranes that separate individual cardiomyocytes from each other
Where do gap junctions form
Form at intercalated discs
What is a GAP junction
Permeable communicating junction that forms where the cell membranes of two different cardiomyocytes fuse
What does a GAP junction provide for fused cardiomyocytes
Free diffusion of ions
What is a syncytium
Cytoplasmic mass containing several nuclei formed by the fusion of cells of by division of nuclei
How are the action potentials helped along ( how ions move with ease)
Ions Move with ease in the intracellular fluid along the longitudinal axes of cardiac muscle fibres to the next cardiac muscle past the intercalated disks
What could the cardiac muscle be described as
Syncytium of many heart muscle cells
