What is true of the cardiac conduction system (pacemaker) of the heart? It cause
ID: 86818 • Letter: W
Question
What is true of the cardiac conduction system (pacemaker) of the heart? It causes the left side of the heart to contract first then the right side It causes the right side of the heart to contract first then the left side It causes both atria to contract then both ventricles to contract It is controlled by conscious thought What is true of the meanings, ventricles and cerebral spinal fluid (CSF)? CSF is found in the ventricles and surrounds the brain and spinal cord CSF is only found in the white matter of the brain The ventricles are filled with blood The meanings only covers the brain and not the spinal cord What statement is NOT true of the spinal nerves? Most nerves carry afferent and efferent information Consist of hundreds to thousands of neuron axons Are organized in pairs, right and left They only innervate muscles, joints and the skinExplanation / Answer
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d) Insulin decreases blood sugar it is secreted by beta cells of Pancrea Insulin helps control blood glucose levels it signalsthe liver and muscle and fat cells to take in glucose from the blood. Insulin helps cells to take in glucose .
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c) it causes both the atria to contact and then both the ventricles to contract
The SA node also called anatomical pacemaker first causes the contraction of atrial muscles, and then AV node causes the ventricles to contract.
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a) CSF(cerebrospinal fluid) is found in ventricles and surrounds the brain and spinal cord
CSF filled cavaties are called ventricles
cerebrospinal fluid is a clear, colourless liquid that protects the brain and spinal cord from chemical and physical injuries
It also carries oxygen , glucose and other needed chemicals from blood to neurons and neuroglia.
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d) They only innervate musles, joints and and the skin is wrong because spinal nerves also innervate internal organs like liver ,kidneyand heart etc.
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