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  • Question 1 - Which of the atrial pressure changes represents the a-wave of the JVP ...

    Incorrect

    • Which of the atrial pressure changes represents the a-wave of the JVP

      Your Answer: Bulging of the tricuspid valve into the atrium during isovolumetric ventricular contraction

      Correct Answer: Atrial systole

      Explanation:

      The a-wave created on the venous pulse curve occurs as a result of atrial systole. Due to the pressure build-up in the atria, it causes a back pressure in the vena cava. This pressure is exerted on the valve and this back pressure is what causes a slight increase in the venous pressure.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      31.1
      Seconds

  • Question 2 - Pendrin is a Cl-/I- exchanger whose function is: ...

    Correct

    • Pendrin is a Cl-/I- exchanger whose function is:

      Your Answer: Transfer of iodide across the thyrocyte apical membrane into the colloid

      Explanation:

      Pendrin is an anion transporter present in the inner ear, thyroid and kidney. It regulates the entrance of iodide from the thyroid cell to the colloid space. It has been proposed that its role could be the maintenance of the ionic composition of the endolymph.

    • This question is part of the following fields:

      • Endocrinology
      • Medicine
      9.9
      Seconds

  • Question 3 - Growth hormone deficiency causes? ...

    Correct

    • Growth hormone deficiency causes?

      Your Answer: Decreased epiphyseal growth

      Explanation:

      Growth hormone deficiency is caused by conditions affecting the pituitary gland, such as tumours. Its effects depend on the age of the patient: in infancy and childhood, growth failure is most likely to occur. The epiphyseal plate is the area in long bones where growth occurs, and it is the area affected by growth hormone deficiency. Poor growth/shortness is the main symptom of GH deficiency in children, usually resulting in growth at about half the usual rate for age.

    • This question is part of the following fields:

      • Endocrinology
      • Medicine
      10.4
      Seconds

  • Question 4 - Stimulation of the carotid sinus results in: ...

    Correct

    • Stimulation of the carotid sinus results in:

      Your Answer: Drop in blood pressure

      Explanation:

      Stimulation of the carotid sinus will result in an increase in the baroreceptor discharge. This will travel via the afferent nerves to the medulla. Signals will pass through the vagus nerve to decrease the sympathetic outflow to the heart and the blood vessels. This inhibition will result in vasodilation of the blood vessels, venodilation and bradycardia hence decreasing the total peripheral resistance and lowering the blood pressure.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      12.3
      Seconds

  • Question 5 - The posterior aspect of the interventricular septum is supplied by: ...

    Correct

    • The posterior aspect of the interventricular septum is supplied by:

      Your Answer: A branch of the right coronary artery

      Explanation:

      The posterior aspect of the heart is supplied by the posterior interventricular artery which is a branch of the right coronary artery.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      15.9
      Seconds

  • Question 6 - During which phase of the cell cycle does DNA synthesis occur? ...

    Correct

    • During which phase of the cell cycle does DNA synthesis occur?

      Your Answer: S

      Explanation:

      DNA synthesis occurs in the S phase of the cell cycle. In the G1 phase the cell prepares to divide. In G2 the cellular organelles divide and in the M phase mitosis occur. In the G0 phase the cell becomes quiescent and does not divide further

    • This question is part of the following fields:

      • Genetics
      • Medicine
      26.7
      Seconds

  • Question 7 - Regarding the anatomy of the intestine, the muscularis propria contains all of which...

    Correct

    • Regarding the anatomy of the intestine, the muscularis propria contains all of which of the following constituents?

      Your Answer: Circular muscle, myenteric plexus, longitudinal muscle

      Explanation:

      The muscularis mucosa/propria consists of the inner circular muscles and the outer longitudinal muscles. Between these muscles is the myenteric plexus.

    • This question is part of the following fields:

      • Gastrointestinal
      • Medicine
      22.7
      Seconds

  • Question 8 - An 18 year old boy, thin with a tall stature, and a high...

    Incorrect

    • An 18 year old boy, thin with a tall stature, and a high arched palate arrives at the hospital with a spontaneous pneumothorax. He is accompanied by his brother who has a similar appearance. You suspect Marfan's Syndrome. The gene encoding which of the following proteins is defective in this condition?

      Your Answer: Elastin

      Correct Answer: Fibrillin-1

      Explanation:

      A variety of proteins compose the structure of microfibrils, the most prominent of which are the two fibrillins. Fibrillin-1 a scaffolding protein is encoded by FBN1 on human chromosome 15q21 and fibrillin-2 is encoded by FBN2 on 5q23. Mutations in FBN1 produce Marfan syndrome, a pleiotropic autosomal dominant connective tissue disorder with prominent manifestations in the skeleton, eye and cardiovascular system. A number of conditions related to Marfan syndrome are also due to FBN1 mutations.

    • This question is part of the following fields:

      • Connective Tissue
      • Medicine
      31.5
      Seconds

  • Question 9 - There will be a proportion of people in a population who have the...

    Correct

    • There will be a proportion of people in a population who have the given condition, disease or attribute at a specified point in time or over a specified period of time. Which of following is the best term which can describe the above?

      Your Answer: Prevalence

      Explanation:

      Prevalence refers to the total number of cases of a particular disease or condition present in a population at a specific point in time or over a specified period. It provides a measure of how widespread the disease or condition is within the population.

      Specificity and sensitivity are terms used to describe the accuracy of diagnostic tests.

      Probability refers to the likelihood of an event occurring.

      Incidence is a measure of how commonly or frequently a disease occurs in a specified population over a period by providing a quick measurement of new disease diagnoses.

    • This question is part of the following fields:

      • Medicine
      • Research Skills
      27.4
      Seconds

  • Question 10 - With regards to the cardiac cycle which of the following is true ...

    Incorrect

    • With regards to the cardiac cycle which of the following is true

      Your Answer: Left ventricular ejection begins before right ventricular ejection

      Correct Answer: Right atrial systole occurs before left atrial systole: as below

      Explanation:

      Cardiac cycle: The first event in the cycle is atrial depolarization (a P wave on the surface ECG) follows by RIGHT ATRIAL and then LEFT ATRIAL contraction. Ventricular activation (QRS) follows after a short interval (the PR interval). LEFT VENTRICULAR contraction starts shortly thereafter RIGHT VENTRICULAR contraction begins. At the end, the aortic valve closure is followed by pulmonary valve closure.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      32.4
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Cardiovascular (2/4) 50%
Medicine (7/10) 70%
Endocrinology (2/2) 100%
Genetics (1/1) 100%
Gastrointestinal (1/1) 100%
Connective Tissue (0/1) 0%
Research Skills (1/1) 100%
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