Heart Contraction Overview
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Questions and Answers

Which type of cardiac muscle cells contract spontaneously?

  • Signal cells
  • Automatic cells (correct)
  • Non-automatic cells
  • Initiating cells

    • What is the role of non-automatic cells in the heart?

  • They initiate the contraction of automatic cells.
  • They require initiation by signal cells to contract. (correct)
  • They spontaneously contract.
  • They signal to the automatic cells to contract.

    • Which cells make up the majority of cardiac myocytes in the heart?

  • Automatic cells (correct)
  • Initiating cells
  • Non-automatic cells
  • Signal cells

    • What happens when the automatic cells of the heart contract?

    <p>They initiate the contraction of non-automatic cells.</p> Signup and view all the answers

    How do non-automatic cells in the heart start contracting?

    <p>By requiring initiation by automatic cells.</p> Signup and view all the answers

    Automatic cells in the heart do not require external stimuli to initiate contractions.

    <p>True</p> Signup and view all the answers

    Non-automatic cells in the heart are responsible for initiating the contractions of automatic cells.

    <p>False</p> Signup and view all the answers

    Most of the cardiac myocytes in the heart are non-automatic cells.

    <p>False</p> Signup and view all the answers

    Automatic cells contract first in the heart, followed by non-automatic cells.

    <p>True</p> Signup and view all the answers

    Non-automatic cells rely on the automatic cells to be stimulated mechanically in order to start contracting.

    <p>False</p> Signup and view all the answers

    What is the characteristic of automatic cells in the heart?

    <p>They spontaneously contract.</p> Signup and view all the answers

    What is the primary role of automatic cells in the heart?

    <p>To initiate contractions and signal to non-automatic cells to contract.</p> Signup and view all the answers

    Why do non-automatic cells in the heart require signaling from automatic cells?

    <p>Because they do not spontaneously contract.</p> Signup and view all the answers

    What is the result of automatic cells contracting in the heart?

    <p>They signal to non-automatic cells to contract.</p> Signup and view all the answers

    What percentage of cardiac myocytes in the heart are non-automatic cells?

    <p>Most of them.</p> Signup and view all the answers

    Your heart beats regularly on it's own without you having to think about it ______

    <p>happening</p> Signup and view all the answers

    There are two types of cardiac ______ cells (myocytes):

    <p>muscle</p> Signup and view all the answers

    Non-automatic cells = do not spontaneously ______, they require their contractions to be initiated by the automatic cells

    <p>contract</p> Signup and view all the answers

    When the automatic cells ______, they signal to the non-automatic cells contract

    <p>contract</p> Signup and view all the answers

    Most cardiac ______ are non-automatic cells

    <p>myocytes</p> Signup and view all the answers

    Match the characteristics of cardiac muscle cells with their definitions:

    <p>Automatic cells = They contract spontaneously without external stimuli. Non-automatic cells = They contract without being signaled by other cells.</p> Signup and view all the answers

    Match the types of cardiac muscle cells with their roles in the heart's contraction:

    <p>Automatic cells = They respond to signaling from other cells. Non-automatic cells = They require signaling to contract.</p> Signup and view all the answers

    Match the cardiac muscle cells with their contraction mechanisms:

    <p>Automatic cells = They contract spontaneously without external stimuli. Non-automatic cells = They contract after receiving signals from automatic cells.</p> Signup and view all the answers

    Match the characteristics of the heart's contraction with the type of cardiac muscle cells involved:

    <p>Spontaneous contraction = Automatic cells Signaling-dependent contraction = Non-automatic cells</p> Signup and view all the answers

    Match the descriptions with the types of cardiac muscle cells:

    <p>Cells that initiate the heart's contraction = Automatic cells Cells that respond to signaling from other cells = Non-automatic cells Cells that contract independently = Automatic cells Cells that require external stimuli to contract = Non-automatic cells</p> Signup and view all the answers

    What is the typical location of the Sinoatrial node in the heart?

    <p>At the junction of the cranial vena cava and the right atrium</p> Signup and view all the answers

    What is the function of the signal sent by the Sinoatrial node?

    <p>It causes both atria to contract and then spreads to the ventricles</p> Signup and view all the answers

    What is the characteristic of the baseline rate of contraction of the Sinoatrial node?

    <p>It can be altered by input from the body</p> Signup and view all the answers

    What is the next step in the cardiac cycle after the signal from the Sinoatrial node reaches the atrioventricular node?

    <p>The atria relax and the ventricles contract</p> Signup and view all the answers

    What is the significance of the Sinoatrial node in the cardiac cycle?

    <p>It is responsible for regulating the heart rate</p> Signup and view all the answers

    The Sinoatrial node is responsible for initiating ventricular contraction.

    <p>False</p> Signup and view all the answers

    The atrioventricular node is located in the right atrium.

    <p>False</p> Signup and view all the answers

    The Sinoatrial node has a fixed rate of contraction that cannot be altered.

    <p>False</p> Signup and view all the answers

    The Sinoatrial node is a bundle of non-automatic cells.

    <p>False</p> Signup and view all the answers

    The cardiac cycle starts with ventricular contraction.

    <p>False</p> Signup and view all the answers

    The Sinoatrial node is a bundle of ______ cells that controls the heart rhythm and rate.

    <p>automatic</p> Signup and view all the answers

    The Sinoatrial node is located at the junction of the ______ vena cava and the right atrium.

    <p>cranial</p> Signup and view all the answers

    The Sinoatrial node sends out a signal that causes both ______ to contract.

    <p>atria</p> Signup and view all the answers

    The signal from the Sinoatrial node then spreads to the ______ node in the atrioventricular septum.

    <p>atrioventricular</p> Signup and view all the answers

    The ______ cycle starts with the contraction of the atria, followed by the contraction of the ventricles and then relaxation.

    <p>cardiac</p> Signup and view all the answers

    What is the purpose of the closure of the AV valves during ventricular contraction?

    <p>To prevent blood from flowing from the ventricles back into the atria</p> Signup and view all the answers

    During which part of the cardiac cycle do the semilunar valves close?

    <p>End of systole/beginning of diastole</p> Signup and view all the answers

    What is the resulting sound of the closure of the AV valves?

    <p>Lub</p> Signup and view all the answers

    What is the function of the closure of the semilunar valves?

    <p>To prevent blood from flowing from the pulmonary artery/aorta back into the ventricles</p> Signup and view all the answers

    What do the 'Lub' and 'Dub' sounds represent during auscultation of the heart?

    <p>Closure of the AV and semilunar valves</p> Signup and view all the answers

    What is the purpose of the closure of the AV valves during ventricular contraction?

    <p>To prevent blood from flowing back into the atria</p> Signup and view all the answers

    During which part of the cardiac cycle do the AV valves close?

    <p>During ventricular contraction</p> Signup and view all the answers

    What is the resulting sound of the closure of the semilunar valves?

    <p>Dub sound</p> Signup and view all the answers

    What is the function of the closure of the semilunar valves?

    <p>To prevent backflow of blood from the pulmonary artery/aorta to the ventricles</p> Signup and view all the answers

    When do the semilunar valves close in the cardiac cycle?

    <p>During ventricular relaxation</p> Signup and view all the answers

    What is the purpose of the heart's cardiac cycle?

    <p>To maintain blood pressure within a range</p> Signup and view all the answers

    What happens during ventricular contraction in the cardiac cycle?

    <p>Ventricles empty into the aorta and pulmonary arteries</p> Signup and view all the answers

    What is the significance of the 'Lub' sound during auscultation of the heart?

    <p>It represents the closure of the AV valves</p> Signup and view all the answers

    What occurs during diastole in the cardiac cycle?

    <p>Ventricles relax and fill with blood from the atria</p> Signup and view all the answers

    Why is it important to maintain blood pressure within a range?

    <p>To prevent a pressure that is too high or too low</p> Signup and view all the answers

    What is the relationship between systole and diastole?

    <p>Systole is active, and diastole is passive</p> Signup and view all the answers

    What is the main function of the AV valves in the cardiac cycle?

    <p>To prevent blood from flowing back into the atria during ventricular contraction</p> Signup and view all the answers

    What occurs during the beginning of systole in the cardiac cycle?

    <p>The ventricles contract and the AV valves close</p> Signup and view all the answers

    What is the relationship between the 'Lub' and 'Dub' sounds during auscultation of the heart?

    <p>The 'Lub' sound occurs during systole and the 'Dub' sound occurs during diastole</p> Signup and view all the answers

    What is the characteristic of ventricular contraction in the cardiac cycle?

    <p>Active contraction of the ventricles</p> Signup and view all the answers

    What is the purpose of the cardiac cycle?

    <p>To pump blood throughout the body</p> Signup and view all the answers

    What is the difference between systole and diastole?

    <p>Systole is active contraction and diastole is passive relaxation</p> Signup and view all the answers

    During ventricular contraction, the AV valves close to prevent blood flow back into the atria.

    <p>False</p> Signup and view all the answers

    The 'Lub' sound is due to the closing of the semilunar valves during the cardiac cycle.

    <p>False</p> Signup and view all the answers

    During diastole, the ventricles empty into the aorta and pulmonary arteries.

    <p>False</p> Signup and view all the answers

    The 'Dub' sound occurs during ventricular relaxation at the end of systole.

    <p>True</p> Signup and view all the answers

    The cardiac cycle consists of atrial contraction immediately followed by ventricular contraction.

    <p>False</p> Signup and view all the answers

    Blood pressure is considered high during diastole and low during systole.

    <p>False</p> Signup and view all the answers

    Match the heart sounds with their corresponding valve closure:

    <p>Lub = Semilunar valves Dub = AV valves</p> Signup and view all the answers

    Match the phases of the cardiac cycle with their corresponding blood pressure:

    <p>Systole = Low pressure Diastole = High pressure</p> Signup and view all the answers

    Match the characteristics of the cardiac cycle with their corresponding descriptions:

    <p>Systole = Ventricular relaxation Diastole = Ventricular contraction</p> Signup and view all the answers

    Match the valves with their corresponding functions in the cardiac cycle:

    <p>AV valves = Prevent blood flow from pulmonary artery/aorta back into ventricles Semilunar valves = Prevent blood flow from ventricles back into atria</p> Signup and view all the answers

    Match the cardiac cycle events with their corresponding phases:

    <p>Closure of AV valves = End of systole/beginning of diastole Closure of semilunar valves = Beginning of systole</p> Signup and view all the answers

    Match the cardiac cycle phases with their corresponding pressures:

    <p>Systole = Small number (low pressure) Diastole = Big number (high pressure)</p> Signup and view all the answers

    During ventricular contraction, the ______ valves snap shut

    <p>AV</p> Signup and view all the answers

    The 'Lub-Dub' sounds heard when auscultating the heart are due to the ______ snapping shut

    <p>valves</p> Signup and view all the answers

    The 'Dub' sound occurs during ventricular ______ at the end of systole

    <p>relaxation</p> Signup and view all the answers

    It is important that blood pressure is maintained within a range to prevent having a pressure that is too high or too ______

    <p>low</p> Signup and view all the answers

    During diastole, the ventricles fill up with blood from the ______

    <p>atria</p> Signup and view all the answers

    Systole in the cardiac cycle is characterized by ventricular ______ into the aorta/pulmonary arteries

    <p>emptying</p> Signup and view all the answers

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