The Heart's Electrical Conduction System PDF

## The Heart's Electrical Conduction System **1. The heart is a pump made up of?** * a) Blood vessels * **b) Muscle tissue** * c) Nervous tissue * d) Cardiac cells **2. The heart needs a source of _______ and _______ to function?** * a) Energy, blood * b) Oxygen, carbon dioxide * c) Glucose, energ...

## The Heart's Electrical Conduction System **1. The heart is a pump made up of?** * a) Blood vessels * **b) Muscle tissue** * c) Nervous tissue * d) Cardiac cells **2. The heart needs a source of _______ and _______ to function?** * a) Energy, blood * b) Oxygen, carbon dioxide * c) Glucose, energy * **d) Energy, oxygen** **3. The heart's pumping action is regulated by?** * a) Hormones * b) Nervous system * **c) Electrical conduction system** * d) All of the above **1. Which of the following _____ Electrical system of the heart? ** * a) Sinoatrial (SA) node * b) Atrioventricular (AV) node * c) Left bundle branch * **d) all of the above** **2. Which of the following _____ Electrical system of the heart ?** * a) Right bundle branch * b) Purkinje fibers * **c) both a and b** * d) none of the above **7. What is the sequence of heart chamber activation caused by the electrical stimulus?** * a) Ventricles, then atria * **b) Atria, then ventricles** * c) Ventricles only * d) Atria only **8. Where is the sinus node (or sinoatrial node) located?** * a) In the left upper chamber (atria) of the heart * **b) In the right upper chamber (atria) of the heart** * c) In the ventricles of the heart * d) Outside the heart **3. What is the name of the small mass of specialized tissue located in the right upper chamber (atria) of the heart?** * **a) Sinus node** * b) Conduction pathways * c) Ventricles * d) Atrioventricular (AV) node **4. After the atria are activated, what happens to the ventricles?** * **a) They contract and pump out blood** * b) They relax and fill with blood * c) They do not respond to the electrical stimulus * d) They generate their own electrical stimulus **5. The structure that generates the electrical stimulus for the heart's beating is called the?** * a) Atrioventricular node * **b) Sinoatrial node** * c) Purkinje fibers * d) Ventricular myocardium **6. The electrical stimulus generated by the sinoatrial node travels down through the:** * **a) Conduction pathways** * b) Aorta * c) Pulmonary artery * d) Inferior vena cava **1. What is the structure that generates the electrical stimulus in the heart?** * a) Ventricles * b) Atria * **c) Sinus node** * d) Conduction pathways **2. How many times per minute does the sinus node generate an electrical stimulus under normal conditions?** * a) 30-60 times * **b) 60-100 times** * c) 100-150 times * d) 150-200 times **1. The electrical impulse _____ from the sinus node to which node?** * **a) Atrioventricular node** * b) Sinoatrial node * c) Ventricles * d) Atria **2. What happens to the impulses after they reach the atrioventricular node?** * a) They continue down the conduction pathway without any change. * b) They are sped up for a short period. * **c) They are slowed down for a very short period, then continue down the conduction pathway** * d) They are blocked from entering the ventricles. **3. The bundle of His divides into which two pathways?** * a) Right and left ventricles * b) Atria and ventricles * **c) Right and left bundle branches** * d) Sinus node and atrioventricular node **4. The purpose of the bundle branches is to?** * **a) Stimulate the right and left ventricles** * b) Slow down the electrical impulses * c) Prevent the electrical impulses from reaching the ventricles * d) Conduct the electrical impulses to the atria **5. What is another name for the atrioventricular node?** * a) Sinoatrial node * b) Bundle of His * **c) AV node** * d) Ventricles **1. How many _____ times per minute does the heart contract when a person is at rest?** * a) 60 times * b) 100 times * **c) 60 to 100 times** * d) 50 times **2. What does each contraction of the ventricles represent?** * **a) One heartbeat** * b) Two heartbeats * c) Half a heartbeat * d) A fraction of a second **3. What happens before the ventricles contract?** * a) The atria contract a fraction of a second * b) The atria expand * c) The blood empties into the ventricles * **d) Both a and c** **1. What is the heart conduction system?** * a) The network of neurons that controls the heartbeat * **b) The network of nodes, cells, and signals that controls the heartbeat** * c) The electrical signals that travel through the heart * d) The expansion and contraction of the heart muscle **2. What happens when your heart beats?** * a) Electrical signals travel through your heart * b) Your heart expands and contracts * c) Blood flow is controlled through your heart and body * **d) All of the above** **3. What does the heart's conduction system do?** * **a) Sends signals to start a heartbeat** * b) Pumps blood through the body * c) Filters waste from the blood * d) Both a and b **4. How does the heart's conduction system control blood flow?** * a) By regulating the pressure in the blood vessels * **b) By contracting and relaxing the heart muscles** * c) By adjusting the size of the heart chambers * d) By filtering out impurities in the blood **5. What are the two types of cells that control the heartbeat?** * a) Nerve cells and pacemaker cells * **b) Conducting cells and muscle cells** * c) Valves and chambers * d) Arteries and veins **6. What type of signals do the conducting cells carry?** * **a) Electrical signals** * b) Nerve impulses * c) Blood pressure signals * d) Hormonal signals **7. Where does the signal to start a heartbeat originate from?** * a) The lungs * b) The brain * **c) The cardiac conduction system** * d) The blood vessels **1. What is the main component of the heart's conduction system?** * a) Valves * b) Blood vessels * **c) Nodes (groups of cells)** * d) Heart chambers **2. Which type of cells control the heart's contractions?** * a) Conducting cells * **b) Muscle cells** * c) Nerve cells * d) Pacemaker cells **3. What is the function of the bundle of His in the heart conduction pathway?** * a) It sends the signal to the top heart chambers * **b) It carries the signal to the Purkinje fibers** * c) It causes the ventricles to contract * d) It delays the signal until the atria are empty **4. What is the final step in the heart conduction pathway?** * **a) The Purkinje fibers carry the signal to the ventricles** * b) The atria contract * c) The AV node delays the signal * d) The SA node creates the intial excitation **5. How many steps are in the heart conduction pathway?** * a) 2 * b) 3 * **c) 4** * d) 5 **1. What causes the intial excitation signal to start the heart conduction pathway?** * **a) The sinoatrial (SA) node** * b) The atrioventricular (AV) node * c) The Purkinje fibers * d) The bundle of His **2. What is the role of the atrioventricular (AV) node in the heart conduction pathway?** * a) It tells the atria to contract * b) It carries the signal the Purkinje fibers * **c) It delays the signal until the atria are empty of blood** * d) It causes the ventricles to contract **1. What causes the heart to expand and contract?** * **a) The electrical signals that travel through the heart conduction system** * b) The blood flow through the heart * c) The oxygen levels in the body * d) The heart rate **2. What does the electrical conduction system in the heart help to control?** * a) The size of the heart * b) The temperature of the body * **c) The flow of blood through the your heart** * d) The rate of breathing **3. What is the main purpose of the electrical conduction system in the heart?** * a) To keep the heart rate steady and even * b)To speed up the heart when more blood and oxygen is needed * c) To slow down the heart when it's time to rest * **d) Both a and b**