Physiology Quiz: Heart and Muscle Function
14 Questions
0 Views

Physiology Quiz: Heart and Muscle Function

Created by
@HealthyFlashback

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following organs has the highest arteriovenous O2 difference under normal resting conditions?

  • Brain
  • Kidney
  • Heart (correct)
  • Skeletal muscle
  • In which phase of the ventricular muscle action potential is the sodium permeability the highest?

  • Phase 3
  • Phase 0 (correct)
  • Phase 2
  • Phase 1
  • Which condition at the A-V node will cause a decrease in heart rate?

  • Decreased acetylcholine levels
  • Increased sodium permeability
  • Increased potassium permeability (correct)
  • Increased norepinephrine levels
  • The 'T wave' is due to which of the following electrical events within the heart?

    <p>Ventricular repolarization</p> Signup and view all the answers

    Frank-Starling's law of the heart explains which of the following?

    <p>Explains the increase in cardiac output that occurs when venous return is increased</p> Signup and view all the answers

    Anaemia caused by vitamin B12 and folate deficiency is characterized as which type of anaemia?

    <p>Megaloblastic anaemia</p> Signup and view all the answers

    The serum component is characterized by which of the following?

    <p>Blood with fibrinogen removed</p> Signup and view all the answers

    The most abundant and buffering capacity buffer system in plasma is which of the following?

    <p>NaHCO3/H2CO3</p> Signup and view all the answers

    Which blood group system can safely receive Rh-negative blood?

    <p>Rh-positive</p> Signup and view all the answers

    What is the significant physiological event indicated by the 'T wave' in an electrocardiogram?

    <p>Ventricular repolarization</p> Signup and view all the answers

    What primarily characterizes the serum component of blood?

    <p>Plasma with fibrinogen and some clotting factors removed</p> Signup and view all the answers

    Which buffer system has the greatest buffering capacity in plasma?

    <p>KHCO3/H2CO3</p> Signup and view all the answers

    Which of the following statements about blood transfusion is correct?

    <p>A person with blood group O is a 'universal blood donor'.</p> Signup and view all the answers

    Which type of anemia is caused by vitamin B12 and folate deficiency?

    <p>Megaloblastic anemia</p> Signup and view all the answers

    Study Notes

    Organ Function and Oxygen Difference

    • The organ with the highest arteriovenous O2 difference under normal resting conditions is the heart.

    Ventricular Muscle Action Potential

    • The sodium permeability is the highest in phase 0 of the ventricular muscle action potential.

    A-V Node and Heart Rate Regulation

    • An increase in potassium permeability at the A-V node will cause a decrease in heart rate.

    ECG and Heart Activity

    • The "T wave" is due to ventricular repolarization within the heart.

    Frank-Starling's Law of the Heart

    • Frank-Starling's law of the heart explains the increase in cardiac output that occurs when venous return is increased.

    Anemia Types

    • Anemia caused by vitamin B12 and folate deficiency is megaloblastic anemia.

    Blood Components and Plasma

    • Serum is characterized by plasma with fibrinogen and some clotting factors removed.
    • Plasma is whole blood with haemocytes removed.

    Buffer Systems in Plasma

    • The most abundant and buffering capacity buffer system in plasma is Bicarbonate buffer system (NaHCO3/H2CO3).

    Cardiac Conduction and Action Potential

    • The fastest rate of conduction of the cardiac action potential occurs in Purkinje fibers.

    Organ Oxygen Demand

    • Skeletal muscle has the highest arteriovenous O2 difference under normal resting conditions.

    Ventricular Muscle Action Potential

    • Sodium permeability is highest in phase 4 of the ventricular muscle action potential.

    Heart Rate Regulation

    • Decreased acetylcholine levels at the A-V node will cause an increase in heart rate.

    ECG Waveforms

    • The T wave is due to ventricular repolarization.

    Cardiac Function

    • Frank-Starling's law of the heart explains the increase in cardiac output when the ventricular end-diastolic volume increases, not when the sympathetic nerves supplying the heart are stimulated.

    Anemia

    • Vitamin B12 and folate deficiency causes megaloblastic anemia.

    Blood Components

    • Serum is characterized by plasma with fibrinogen and some clotting factors removed.

    Blood Buffering Systems

    • The KHCO3/H2CO3 buffer system has the highest buffering capacity in plasma.

    Blood Transfusion

    • ABO blood group system cannot be transfused without cross-matching.
    • A person with blood group O is not always a "universal blood donor".
    • A person with blood group AB is not always a "universal recipient".
    • Rh-positive people should not receive Rh-negative blood.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of human physiology with these questions about heart and muscle function, including arteriovenous O2 differences and ventricular muscle action potentials.

    More Like This

    Use Quizgecko on...
    Browser
    Browser