MCQ Snacks - (Free Trial) - Physiology

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| By Mcq Snacks
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Mcq Snacks
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Quizzes Created: 3 | Total Attempts: 1,545
| Attempts: 201
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  • 1/10 Questions

    Which of the following is true for the excitation-contraction coupling of all muscle types (skeletal, cardiac, and smooth)?

    • An action potential causes calcium levels in the cytosol to increase
    • Calcium binds to troponin
    • Thick and thin filaments slide past each other
    • A & c
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About This Quiz

Explore key physiological concepts with MCQ Snacks' free trial, featuring questions on systemic vascular resistance, aldosterone receptors, pulmonary circulation, nerve threshold, and cardiac sounds.

MCQ Snacks - (Free Trial) - Physiology - Quiz

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  • 2. 

      ln isometric exercise all are increased except :

    • Heart rate

    • Cardiac output

    • Mean arterial pressure

    • Systemic vascular resistance

    Correct Answer
    A. Systemic vascular resistance
    Explanation
    In isometric exercise, the muscles contract without any change in length, which leads to an increase in blood pressure. As a result, mean arterial pressure, cardiac output, and heart rate all increase. However, systemic vascular resistance refers to the resistance to blood flow in the blood vessels, and in isometric exercise, it remains unchanged or may even decrease due to vasodilation. Therefore, all the options except systemic vascular resistance increase during isometric exercise.

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  • 3. 

    Which of the following is true about fourth heart sound ‘S4‘ :

    • Can be heard by the unaided ear

    • Frequency is greater than 20 Hz

    • Heard during ventricular filling phase

    • Heard during ventricular ejection phase

    Correct Answer
    A. Heard during ventricular filling phase
    Explanation
    S4 is heard during the last rapid filling phase of cardiac cycle.

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  • 4. 

    Broca’s area is concerned with:

    • Word formation

    • Comprehension

    • Repetition

    • Reading

    Correct Answer
    A. Word formation
    Explanation
    Broca's area is the motor speech area concerned with word formation.

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  • 5. 

    Which of the following hormone is not secreted by the kidney:

    • Renin

    • Angiotensin I

    • Erythropoietin

    • 1, 25 Dihydroxycholecalciferol

    Correct Answer
    A. Angiotensin I
    Explanation
    Angiotensin I is formed by action of Renin (secreted by kidney) on Angiotensinogen (secreted by liver).

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  • 6. 

      Increase in threshold level of a nerve on application of a slowly rising sub-threshold stimulus is known as:

    • Adaptation

    • Accomodation

    • Refractoriness

    • Electrotonus

    Correct Answer
    A. Accomodation
    Explanation
    Accommodation refers to the increase in threshold level of a nerve when a slowly rising sub-threshold stimulus is applied. This phenomenon allows the nerve to adapt to the gradually increasing stimulus and eventually reach its threshold level, resulting in an action potential. This process is important for the nerve to properly respond to varying levels of stimuli and maintain its sensitivity.

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  • 7. 

      Pulmonary circulation differs from systemic circulation

    • Pulmonary vasodilation in hypoxia

    • Pulmonary vasoconstriction in hypoxia

    • Decreased blood volume during systole

    • Increased basal vasoconstrictor tone

    Correct Answer
    A. Pulmonary vasoconstriction in hypoxia
    Explanation
    In hypoxia, the body's response is to constrict the blood vessels in the lungs, known as pulmonary vasoconstriction. This helps to redirect blood flow to areas of the lungs that are better oxygenated, improving the efficiency of gas exchange. This is in contrast to systemic circulation, where vasodilation occurs in response to hypoxia to increase blood flow to tissues and organs.

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  • 8. 

    When a muscle cell is relaxed and intracellular ATP levels are normal, a crossbridge will remain in which of the following states?

    • Bound to actin and in the low-energy form

    • Bound to actin and in the high-energy form

    • In the high-energy form, with ADP and Pi bound to it

    • In the high-energy form, with ATP bound to it

    Correct Answer
    A. In the high-energy form, with ADP and Pi bound to it
    Explanation
    When a muscle cell is relaxed and intracellular ATP levels are normal, a crossbridge will remain in the high-energy form with ADP and Pi (inorganic phosphate) bound to it. This is because during muscle contraction, ATP is hydrolyzed into ADP and Pi, releasing energy that is used to power the movement of the crossbridge. In the relaxed state, the crossbridge is still bound to actin but is in the high-energy form, ready to undergo the power stroke and generate force when the muscle is stimulated to contract.

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  • 9. 

    All of the following statements are true for ‘Intestinal Motility’ except:

    • Does not depend on Gastric motility

    • Increased by Distension

    • Increased by Acetylcholine

    • Increased by cholecystokinin

    Correct Answer
    A. Does not depend on Gastric motility
    Explanation
    Intestinal motility is influenced by gastric motility. eg: Migratory motor complex, gastroileal reflex

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  • 10. 

      Aldosterone receptors are present in all except

    • Liver

    • Colon

    • Hippocampus

    • Distal nephron

    Correct Answer
    A. Liver

Quiz Review Timeline (Updated): May 6, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • May 06, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 02, 2019
    Quiz Created by
    Mcq Snacks
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