Podcast
Questions and Answers
Which structure in the heart is responsible for initiating the electrical impulses that cause the heart to beat?
Which structure in the heart is responsible for initiating the electrical impulses that cause the heart to beat?
- Purkinje fibers
- Sinoatrial (SA) node (correct)
- Atrioventricular (AV) node
- Bundle of His
Which nervous system increases heart rate by releasing norepinephrine?
Which nervous system increases heart rate by releasing norepinephrine?
- Both sympathetic and parasympathetic nervous systems
- Parasympathetic nervous system
- Sympathetic nervous system (correct)
- Autonomic nervous system
Which ion is responsible for initiating action potentials in the heart?
Which ion is responsible for initiating action potentials in the heart?
- Chloride ions
- Potassium ions
- Sodium ions
- Calcium ions (correct)
Which factors can increase the right atrial pressure?
Which factors can increase the right atrial pressure?
What are Korotkoff's sounds?
What are Korotkoff's sounds?
Which factor is defined by Poiseuille's law and directly proportional to the fourth power of the vessel radius?
Which factor is defined by Poiseuille's law and directly proportional to the fourth power of the vessel radius?
Which cell is responsible for performing the contraction of the heart?
Which cell is responsible for performing the contraction of the heart?
Where is the atrioventricular (AV) node located?
Where is the atrioventricular (AV) node located?
What is the function of the bundle of His?
What is the function of the bundle of His?
What is the primary pacemaker of the heart?
What is the primary pacemaker of the heart?
What is the equation that describes the relationship between pressure gradient, flow rate, and resistance in a cylindrical vessel?
What is the equation that describes the relationship between pressure gradient, flow rate, and resistance in a cylindrical vessel?
What is the most frequent cause of atrial fibrillation (AFib)?
What is the most frequent cause of atrial fibrillation (AFib)?
What is the equation that relates pressure, flow, and resistance in determining blood flow through the circulation?
What is the equation that relates pressure, flow, and resistance in determining blood flow through the circulation?
What type of flow occurs when blood flows smoothly through a long, straight blood vessel?
What type of flow occurs when blood flows smoothly through a long, straight blood vessel?
Which part of the heart is responsible for generating electrical impulses that cause the heart to beat?
Which part of the heart is responsible for generating electrical impulses that cause the heart to beat?
What is the function of the AV node?
What is the function of the AV node?
What is the role of the Purkinje fibers in the heart?
What is the role of the Purkinje fibers in the heart?
Which nervous system releases acetylcholine to slow down the heart rate?
Which nervous system releases acetylcholine to slow down the heart rate?
According to Ohm's law, what is the relationship between flow rate, pressure difference, and total resistance in a circuit?
According to Ohm's law, what is the relationship between flow rate, pressure difference, and total resistance in a circuit?
What is the relationship between conductance and resistance?
What is the relationship between conductance and resistance?
What effect does an increase in hematocrit have on blood viscosity?
What effect does an increase in hematocrit have on blood viscosity?
What is the advantage of vascular compliance?
What is the advantage of vascular compliance?
During which phase of the cardiac muscle action potential does rapid depolarization occur?
During which phase of the cardiac muscle action potential does rapid depolarization occur?
What is the main function of the intercalated discs in the heart?
What is the main function of the intercalated discs in the heart?
Why does the heart function as a functional syncytium, while skeletal muscle does not?
Why does the heart function as a functional syncytium, while skeletal muscle does not?
What is the absolute refractory period in the cardiac muscle action potential?
What is the absolute refractory period in the cardiac muscle action potential?
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