Understanding Resistance and Flow in Vascular Circuits

Which structure in the heart acts as the natural pacemaker and initiates the electrical impulses that cause the heart to beat?

Which nervous system increases heart rate by releasing norepinephrine?

Which hormone released by the adrenal glands increases heart rate?

Which ions cause the initiation of action potentials in the heart?

Which of the following is a characteristic of atrial fibrillation (AFib)?

What is the equation that describes the relationship between pressure gradient, flow rate, and resistance in a cylindrical vessel?

Which of the following is true about laminar flow?

What is the most likely cause of ventricular fibrillation (VFib)?

Which one of the following is the primary pacemaker of the heart?

Which one of the following is responsible for conducting the electrical impulses from the AV node to the ventricles?

Which one of the following cells spreads the electrical impulses throughout the ventricles?

Which one of the following is responsible for initiating each heartbeat and setting the heart rate?

Which of the following structures is responsible for generating and conducting electrical impulses throughout the heart?

During which phase of the cardiac muscle action potential does rapid depolarization occur?

Which of the following is true about the absolute refractory period in the cardiac muscle action potential?

During which phase of the cardiac cycle do the ventricles contract and push blood out of the heart?

According to the text, what is the relationship between resistance and flow in a circuit?

What is the relationship between conductance and resistance?

According to the text, how does the diameter of a vessel affect conductance?

What is the advantage of vascular compliance?

Which factors regulate right atrial pressure?

What can increase right atrial pressure?

What are Korotkoff's sounds?

Which factors determine hemodynamics according to Poiseuille's law?

How is blood flow related to vessel radius according to Poiseuille's law?

Which of the following is NOT a factor that can increase right atrial pressure?

Which of the following is responsible for contracting to make the heart beat?

Which of the following describes the electrical activity of the SA node over time?

Which of the following is true about the delay at the AV node and Bundle?

Which of the following is true about normal and ectopic pacemakers?

True or false: Right atrial pressure is regulated solely by the ability of the heart to pump blood out of the right atrium and ventricle into the lungs.

True or false: Increased blood volume can increase the right atrial pressure.

True or false: Dilation of the arterioles allows rapid flow of blood from the veins into the arteries.

True or false: Korotkoff's sounds are produced by the smooth flow of blood through the compressed artery.

True or false: According to Poiseuille's law, blood flow is inversely proportional to the fourth power of the vessel radius.

True or false: The pressure gradient driving blood flow is determined by the difference in pressure between the peripheral veins and the right atrium.

True or false: Vessel length has a direct effect on blood flow according to Poiseuille's law.

True or false: Blood viscosity is one of the physical properties that determine hemodynamics.

True or false: Increased large vessel tone can increase the right atrial pressure.

True or false: According to Poiseuille's law, blood flow is directly proportional to the fourth power of the vessel radius.