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Cards In This Set
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What are the three types of muscle?
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Cardiac, smooth, and skeletal
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Cardiac muscle contains protein filaments called what?
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Actin and myosin
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He fibres in cardiac muscle are - - - - - - - than in skeletal muscle
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Shorter
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The actin and myosin protein filaments in the myocardium are arranged in disc shaped cells that allow electrical signals to pass between the cells in order to make the heart --------
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Contract
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The cardiac muscle is voluntary or involuntary?
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Involuntary
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Contraction in cardiac muscle is initiated by the sinotorial - - - -
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Node
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The sinotorial node is located in the right or left atrium of the heart?
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Right
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The ventricle contract and pumps blood into the what?
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Arteries
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What is known as the pacemaker?
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Sinotorial Node
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When the sinotorial node does not function correctly what can be fitted?
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A pacemaker
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Are there small or large numbers of mitochondria in cardiac muscle?
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Large
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The myocardial cells can only contract aerobically or anaerobically?
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Aerobically
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The myocardium extracts a large % of oxygen from the blood so during exercise the heart has to pump more blood to supply increased - - - - - -
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Demand
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Blood flow can be reduced to the heart and what might be the consequence of this?
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Myocardial ischaemia leads to reduced oxygen delivery (hypoxia) which can make cardiac muscle cells die. This can lead to pains in the chest or arm as angina (which means strangled heart) It can lead to a heart attack or myocardial infarction. High intensity exercise can cause problems.
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Smooth muscleare found in the hollow structures such as?
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Digestive system circulatory, urinary and repro sytems.
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