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. Lesions of ventromedial hypothalamus typically result in:
A. anorexia
B. obesity
C. hypersexuality
D. amnesia
2. Which of the following is pathognomonic of decerebration?
A. Exaggerated standing
B. Babinski sign
C. Absence of saccades
D. Relief of spasticity by cerebellectomy
3. In terms of serum estradiol (E) and progesterone (P), and inhibin, the induction of the preovulatory LH surge is associated with which of the following?
A. High E and low P
B. High E, high P, and high inhibin B
C. Low E and low P
D. Low E and high P
4. Oxidative capacity is highest in:
A. type I muscle fibers
B. type IIA muscle fibers
C. type IIB muscle fibers
D. None of these
5. The SI unit of pressure is:
A. mm Hg
B. cm H2O
C. Pascal
D. Torr
6. The functional unit of a skeletal muscle fiber is the
A. Sarcolemma.
B. Sarcomere.
C. Sarcoplasmic reticulum.
D. Myofibril.
7. The pull called tension is a (n) ________ force.
A. Passive
B. Assertive
C. Aggressive
D. Active
8. Which of the following statements is incorrect?
A. Thyroxine is biologically more active than triiodothyronine.
B. Cells of the anterior pituitary convert T4 to T3 using type 2 deiodinase
C. Neither A nor B
D. Both A and B
9. Ryanodine receptor is located in the:
A. sarcolemma
B. T-tubule
C. terminal cisterns of sarcoplasmic reticulum
D. cytosol
10. The duration of action potential in a nerve is typically closest to:
A. 2 ms
B. 20 ms
C. 200 ms
D. 2000 ms
11. Delta waves (0.5-4 Hz) are seen in:
A. stage 1 sleep
B. stage 4 sleep
C. an awake adult with eyes open
D. an awake adult with eyes closed
12. The procedure in which the hindbrain and the spinal cord are separated from the rest of the brain by transection at the superior border of pons is called:
A. decortication
B. decerebration
C. deafferentation
D. rhizotomy
13. Which area is uniquely concerned with color vision?
A. V1
B. V3
C. LO
D. V8
14. The transient loss of the ability to discriminate between blue and green following the use of sildenafil is due to inhibition of:
A. cGMP-PDE3
B. cGMP-PDE4
C. cGMP-PDE5
D. cGMP-PDE6
15. Diurnal variation in eosinophil count is due to
A. cortisol
B. insulin
C. thyroid hormones
D. thrombopoietin
16. Physiologically, the most important choleretic(s) is/ are:
A. bile salts
B. CCK
C. secretin
D. gastrin
17. The mass of 1 mole of potassium is 39 g. If the potassium chloride concentration of a solution is 39 mg %, the concentration of potassium in this solution is closest to:
A. 1 mmol/L
B. 3.9 mmol/L
C. 10 mmol/L
D. 100 mmol/L
18. Neuron C responds to stimulation of neuron A with a propagated action potential only when neuron B (which terminates only on neuron C) is also simultaneously stimulated. Which of the following inferences is justified?
A. Neuron C releases glycine.
B. Neuron B releases an excitatory neurotransmitter.
C. The synapse between A and C is axosomatic.
D. The neurotransmitter released by neuron A opens K channels in neuron C.
19. Impaired stereognosis in the absence of a detectable defect in touch and pressure sensation points to a lesion in the:
A. dorsal column
B. medial lemniscus
C. parietal lobe posterior to the postcentral gyrus
D. any of the above locations
20. Which of the following statements about synaptic potentials is incorrect?
A. They are propagated down the postsynaptic neuron.
B. They undergo spatiotemporal summation.
C. They are analogous to generator potentials and end-plate potentials.
D. IPSP hyperpolarize the postsynaptic neuron.
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