30 Questions
Which of the following is NOT one of the pacemakers that control the pace of the heart according to the text?
Brain
Which system can influence heart rate according to the text?
Nervous system
Which of the following is NOT a pacemaker involved in controlling the pace of the heart according to the text?
Ventricles
Which system can influence heart rate through the release of hormones according to the text?
Endocrine system
Which cells in the heart are responsible for spontaneously firing electrical commands to tell the cardiomyocytes to contract?
SA node
What is the role of the AV node in the conduction system of the heart?
To delay the electrical signal before it reaches the ventricles
Which of the following is responsible for the contraction of cardiac muscle cells?
Ca2+
What is the function of intercalated discs and gap junctions in cardiac muscle?
To allow for synchronized contraction of all cardiac muscle cells
Which of the following is the correct definition of Mobitz Type 1 (Wenckebach)?
Lengthening of PR interval followed by a dropped beat
Which of the following is a cause of tachycardia?
Exercise
Which of the following is true about veins?
They have thin walls and can contract or expand
Which of the following is true about laminar flow?
It has a steady rate and the fastest velocity in the center of the vessel
Which of the following factors can increase the right atrial pressure?
Increased blood volume
What is the formula for calculating mean arterial pressure (MAP)?
MAP = DBP + 1/3 (SBP - DBP)
Which of the following statements about venous pressures is true?
Venous pressure can be estimated by observing distention in the neck
What are the four primary forces (Starling forces) that determine fluid movement in and out of capillaries?
Which of the following is true about the interstitial fluid hydrostatic pressure (Pif)?
Pif force fluid inward through the capillary membrane
What is the role of the lymphatic system in fluid balance?
It picks up excess water and protein and returns them to the bloodstream
What is the main function of precapillary sphincters?
To contract and decrease blood flow to capillaries
Which plasma protein is responsible for 80% of the oncotic pressure?
Albumin
What happens when capillary pressure increases too much?
Edema occurs as fluids are forced out of the capillaries
What is the main theory behind autoregulation of blood flow in specific tissues?
Myogenic theory
Which of the following is NOT a characteristic of the action potential in cardiac muscle cells compared to skeletal muscle cells?
Cardiac muscle cells use Na+ to repolarize
Which of the following is NOT a cause of cardiac arrhythmias?
High levels of potassium in the blood
Which of the following is NOT an effect of parasympathetic stimulation on the SA node?
Decreased stroke volume
What is the purpose of the AV bundle delay in the conduction system of the heart?
To synchronize the contraction of the atria and ventricles
According to Ohm's Law, which of the following equations correctly represents the relationship between flow (F), pressure gradient (∆P), and resistance (R)?
F = ∆P/R
Which of the following statements accurately describes the relationship between total peripheral resistance (TPR) and blood vessel constriction/dilation?
TPR increases with blood vessel constriction and decreases with blood vessel dilation.
What is the relationship between conductance and resistance in a blood vessel?
Conductance is inversely proportional to resistance.
What effect does an increased hematocrit have on blood viscosity?
Increased hematocrit increases blood viscosity.
Quiz: Understanding the Distensibility of Arteries and Veins Test your knowledge on the distensibility of arteries and veins with this quiz. Explore the differences between the two and how they function as blood reservoirs. Learn how sympathetic stimulation affects the pressure at different volumes in both arteries and veins.
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