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  • Question 1 - The spinal cord receive its blood supply from the following arteries except: ...

    Incorrect

    • The spinal cord receive its blood supply from the following arteries except:

      Your Answer: Segmental radicular arteries

      Correct Answer: Lateral spinal artery

      Explanation:

      The spinal cord (SC) is supplied by the single anterior spinal artery which supplies the anterior two thirds of the SC and paired posterior spinal arteries supplying the posterior one third. Anastomoses between the spinal arteries supply the lateral column. These arteries originate near the cervico-occipital junction and therefore have a smaller calibre and often discontinue. Thus, they require reinforcement by segmental/radicular arteries which are branches of the ascending cervical artery, deep cervical artery, intercostal arteries, lumbar arteries and lateral sacral arteries

    • This question is part of the following fields:

      • Medicine
      • Neurology
      9.8
      Seconds

  • Question 2 - The blood supply to the greater curvature of the stomach is via the:...

    Incorrect

    • The blood supply to the greater curvature of the stomach is via the:

      Your Answer: Right and left gastric arteries

      Correct Answer: Right and left gastro-epiploic arteries

      Explanation:

      The blood supply to the greater curvature of the stomach is via the left and the right gastro-epiploic arteries branching from the splenic artery near the hilum.

    • This question is part of the following fields:

      • Gastrointestinal
      • Medicine
      7.6
      Seconds

  • Question 3 - Myocardial contractility is improved by: ...

    Correct

    • Myocardial contractility is improved by:

      Your Answer: Caffeine

      Explanation:

      Caffeine and other theophyllines breakdown cAMP and have a positive ionotropic effect on the heart. Drugs like quinidine, procainamide and conditions like hypoxia and hypercapnia decreases the contractility of the heart.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      3.9
      Seconds

  • Question 4 - Which statement is correct? ...

    Correct

    • Which statement is correct?

      Your Answer: MtDNA principally encodes for proteins that are involved in oxidative phosphorylation for the production of ATP in the cell.

      Explanation:

      Mitochondria have no nucleus instead they contain their own free floating circular genome (MtDNA), which encodes 13 different subunits of proteins involved in oxidative phosphorylation. The remainder of the mitochondrial proteins are nuclear encoded, synthesized in the cytoplasm, and transported into the mitochondria.

    • This question is part of the following fields:

      • Genetics
      • Medicine
      18.8
      Seconds

  • Question 5 - Which enzyme is responsible for the conversion of testosterone to dihydrotestosterone? ...

    Correct

    • Which enzyme is responsible for the conversion of testosterone to dihydrotestosterone?

      Your Answer: 5α-reductase

      Explanation:

      The enzyme 5α-reductase synthesizes DHT from testosterone in the prostate, testes, hair follicles, and adrenal glands. This enzyme reduces the 4,5 double-bond of the testosterone. Relative to testosterone, DHT is much more potent as an agonist of the androgen receptor.

    • This question is part of the following fields:

      • Endocrinology
      • Medicine
      4.1
      Seconds

  • Question 6 - Endothelial cells produce the following substance(s): ...

    Correct

    • Endothelial cells produce the following substance(s):

      Your Answer: All of the above

      Explanation:

      Endothelial cells produce thromboxane, prostacyclins, nitric oxides, endothelins, IL-1 and TNF.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      6.5
      Seconds

  • Question 7 - Which of the following statements correctly describes a function of the parasympathetic innervation...

    Correct

    • Which of the following statements correctly describes a function of the parasympathetic innervation of the GI tract.

      Your Answer: Parasympathetic cholinergic activity increases the activity of intestinal smooth muscle

      Explanation:

      The parasympathetic nerves stimulate peristalsis and relax the sphincters; they also stimulate secretion. Acetylcholine is the neurotransmitter of the parasympathetic system.

    • This question is part of the following fields:

      • Gastrointestinal
      • Medicine
      11.1
      Seconds

  • Question 8 - Which of the following corresponds to an oblique line drawn from the sternal...

    Incorrect

    • Which of the following corresponds to an oblique line drawn from the sternal end of the left 3rd costal cartilage to the sternal end of the right 6th costal cartilage?

      Your Answer: Inter-ventricular septum

      Correct Answer: Atrio-ventricular (coronary) groove

      Explanation:

      The AV groove corresponds to the right border of the heart. The right border corresponds to a line drawn from the 3rd right costal cartilage to the 6th right costal cartilage; this border is slightly convex to the right.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      39.5
      Seconds

  • Question 9 - Which of the following factors serve to decrease cardiac output? ...

    Correct

    • Which of the following factors serve to decrease cardiac output?

      Your Answer: Standing from a lying position

      Explanation:

      Sleep has no effect on the cardiac output. Anxiety, excitement, increased body temperature and pregnancy will increase the cardiac output. Standing from a lying position will decrease the cardiac output transiently.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      7.2
      Seconds

  • Question 10 - What is the effect of catecholamines (i.e. increased heart rate) on the pressure...

    Correct

    • What is the effect of catecholamines (i.e. increased heart rate) on the pressure volume loop?

      Your Answer: Shifts the diastolic pressure curve upward and leftward

      Explanation:

      Catecholamines have a positive ionotropic and chronotropic effect on the heart. The ventricles develop greater tension during systole resulting in an increase in the stroke volume. The increase in stroke volume results in a decrease in the end diastolic volume. This pushes the loop towards the left and upwards.

    • This question is part of the following fields:

      • Cardiovascular
      • Medicine
      16.2
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Medicine (7/10) 70%
Neurology (0/1) 0%
Gastrointestinal (1/2) 50%
Cardiovascular (4/5) 80%
Genetics (1/1) 100%
Endocrinology (1/1) 100%
Passmed
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