A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Heat energy produced from muscle contraction is released through the ________ system.
A. integumentary
B. respiratory
C. cardiovascular
D. urinary
2. Protein kinase C is activated by:
A. IP3
B. diacylglycerol (DAG)
C. cAMP
D. guanylyl cyclase
3. The normal basal metabolic rate in a euthyroid adult male is (BSA is body surface area):
A. 10-15 kcal/m2 BSA/hr
B. 20-25 kcal/m2 BSA/hr
C. 35-40 kcal/m2 BSA/hr
D. 45-60 kcal/m2 BSA/hr
4. If an individual is breathing 15 times per minute, respiratory frequency is approximately:
A. 0.1 Hz
B. 0.15 Hz
C. 0.2 Hz
D. 0.25 Hz
5. Which of the following types of cells work as scavenger cells in the CNS?
A. Microglia
B. Oligodendroglia
C. Ependymal cells
D. Astrocytes
6. Enterocytes are replenished by mitotically active undifferentiated cells located in:
A. Brunner's glands
B. crypts of Lieberkuhn
C. Peyer's patches
D. gut associated lymphoid tissue
7. Which of the following defines the pressure in the vascular system in the absence of blood flow?
A. Pulse pressure
B. Critical closing pressure
C. Mean circulatory pressure
D. Perfusion pressure
8. During heavy exercise the cardiac output (CO) increase upto five fold while pulmonary arterial pressure rises very little. This physiological ability of the pulmonary circulation is best explained by:
A. Increase in the number of open capillaries
B. Sympathetically mediated greater distensibility of pulmonary vessels
C. Large amount of smooth muscle in pulmonary arteries
D. Smaller surface area of pulmonary circulation
9. In healthy humans, the earliest the first part of a test meal reaches the cecum is in about:
A. 4 hours
B. 6 hours
C. 9 hours
D. 12 hours
10. A 'reward center' is located in:
A. prefrontal cortex
B. nucleus accumbens
C. medial forebrain bundle
D. All these
11. Thin filaments at either end of the sarcomere are attached to the
A. Z line.
B. M line.
C. H band.
D. A band.
12. Gap junctions are made up of a protein called:
A. connexin
B. clathrin
C. cadherin
D. calcineurin
13. Cross-bridges are portions of
A. Actin molecules.
B. Myosin molecules.
C. Troponin molecules.
D. Tropomyosin molecules.
14. Which of the following hormone(s) is/are normally released by the stomach into the systemic circulation?
A. Ghrelin
B. Gastrin
C. Pepsinogen
D. Secretin
15. Which of the following hormones does not act via a G-protein coupled receptor in the cell membrane?
A. Thyrotropin releasing hormone
B. Angiotensin II
C. Antidiuretic hormone
D. Thyroxine
16. Insulin dependent glucose uptake into skeletal muscle and adipose tissue is mainly mediated by:
A. GLUT 1
B. GLUT 2
C. GLUT 3
D. GLUT 4
17. When calcium ion binds to troponin
A. Tropomyosin moves out of the groove between the actin molecules
B. Actin sites on the myosin are exposed
C. Actin heads will bind to myosin
D. Muscle relaxation occurs
18. Which of the following fibers has the greatest threshold?
A. Touch
B. Pain
C. Pressure
D. Cold
19. Motor neurons in the myenteric plexus that stimulate the contraction of visceral smooth muscle in the gastrointestinal tract release:
A. acetylcholine
B. vasoactive intestinal polypeptide
C. nitric oxide
D. somatostatin
20. Which of the following hormones is not detectable in normal females?
A. Androstenedione
B. Testosterone
C. Dehydroepiandrosterone sulfate
D. None of these
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