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level: Cardiac Muscle

Questions and Answers List

level questions: Cardiac Muscle

Question	Answer
What forms the myocardium?	cardiac muscle tissue forms the myocardium
What pumps the blood through the heart and blood vessels?	Contractions resulting from sliding filament mechanisms pump the blood
True of False: Cardiac muscle tissue is striated	true
Mature cardiac muscle cells exhibit a _____.	a cross striation pattern one or 2 centrally located nuclei numerous mitochondria
What surrounds the muscle cells?	surrounding the muscle cells is a delicate sheath of endomysial connective tissue with a rich capillary network
What is the site of adhesion?	intercalated disc
What is the site of gap junction	intercalated disc
what do intercalated disc provide the cell?	structural integrity, allow cells to pull against something
Where do muscle cells join?	at intercalated discs
What separates cells	Endomysium seperates cells
Function of endomysium	binds adjacent cardiac fibers
What are the three types of cell junctions?	- Desmosomes - Fasciae adherens - Gap junctions
What causes the sliding filament mechanism?	contraction is triggered by Calcium entering the sarcoplasm and which they diffuse to the sarcomeres
What is the basis for the rhythmic heartbeat?	inherent rhythmicity
Are all cardiac cells innervated	No
Name this structure	Intercalated disc
Name this structure	Cardiac muscle cell
Name this structure	Nucleus
Name this structure	Sarcolemma
Name this structure	T tuble
Name this structure	Sarcoplasmic Reticulum
Name this structure	Nucleus
Name this structure	Intercalated Discs
Name this structure	Gap Junctions - intercalated disc for gap junctions
Name this structure	Fasciae adherens - intercalated disc for adherens
Name this structure	Mitochondria
Name this structure	Z disc
Name this structure	I band
Name this structure	A band
Name this structure	I band