CV4 Coupling and Muscle Flashcards
5 common causes of arrhythmia.
Abormal rhythmicity of the pacemaker
Shift of pacemaker from SA node to another site in the heart
Blocks at diff points in the spread of electrical impulse through the hear
Abnormal pathways of impulse trasmission thru heart
Spont gen of spurious impulses in any part of the heart
AF makes the blood flow inside the heart somewhat irregular which can cause
blood clots to form and carry a risk of stroke
AF occurs when the upper chambers and the lower chambers are not ___ causing the heart to
coordinated, too slowly, quickly, or irregularly
How does skeletal muscle act?
on the skeleton via tendons
EC coupling
The process by which electrical excitation of the muscle surface membrane triggers muscle contraction
Electrical excitation casues muscle contraction
Intracellular Ca triggers and ___ contraction in both skeletal and cardiac muscle
sustains
Ca concentrations are higher in the
EC
Sarcomere
basic unit of striated muscle tissue
Cardiac muscle morphology
Shorter, branched, and interconnected fromend to end by intercalculated discs
Intercalcated disks contaon
Desmosomes (mech link)
Gap junctions (elect link)
What are the 3 kinds of proteins in muscle
contractile
Regulatory
Structural
Contractile Proteins
Actin and mysoin - generate force during contraction
Regulatory proteins
Troponin and Tropomyosin - switch off the contration
Structural
Keep thick and thin in alignment
Actin = __ filalment
thin
