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. The biologically most active androgen is:
2. Physical evidence that supports the sliding filament theory of muscle contraction includes
A. Increased width of the H band during contraction.
B. Increased width of the I band during contraction.
C. Decreased distance between Z lines during contraction.
D. Decreased width of the A band during contraction.
3. Which of the following strategies would most likely be therapeutic in an individual with achalasia?
A. Injection of tetanus toxin into the lower esophageal sphincter
B. Administration of a nitric oxide synthase inhibitor
C. Surgical division of the lower esophageal sphincter
D. Administration of a muscarinic receptor agonist
4. JAK-STAT pathways mediate the effects of:
D. Growth hormone
5. When energy reserves in a muscle are exhausted and lactic acid levels increase, ________ occurs.
A. An oxygen debt
6. Which of the following is a heat conserving mechanism?
C. Insensible water loss
D. Curling up in a ball
7. Proprioceptive information reaches consciousness through the :
A. Spinothalamic system
B. Dorsal column - medial lemniscal pathway
C. Spinocerebellar pathway
D. A and B
8. Which of the following is absent in decorticate animals?
A. Hopping and placing reaction
B. Temperature regulation
C. Vestibulo-ocular reflex
D. Gross movements
9. In the neurons that innervate skeletal muscles, the cytoplasm of the synaptic terminal contains mitochondria and vesicles filled with molecules of the neurotransmitter
D. Antidiuretic hormone.
10. Which of the following organelles is a major site of steroidogenesis?
A. Rough endoplasmic reticulum
D. Smooth endoplasmic reticulum
11. Which of the following statements about visceral smooth muscle is incorrect?
A. Stretch of smooth muscle consistently increases active tension.
B. Twitch duration is typically longer when compared to skeletal muscle.
C. Contraction can occur in the absence of extrinsic neural innervation.
D. Neighboring cells are electrically coupled by means of gap junctions.
12. The osmolar concentration of sodium in normal human plasma is approximately:
A. 275 - 295 mOsm/L
B. 240 - 250 mOsm/L
C. 135 - 145 mOsm/L
D. 95 - 110 mOsm/L
13. Check all correct statements regarding oxytocin.
A. It is essential for milk ejection
B. It increases uterine contractility
C. It facilitates ejaculation of semen
D. All these
14. The gate theory of pain was proposed by:
A. Cannon and Bard
B. Charles Sherrington
C. Wall and Melzack
D. Weber and Fechner
15. The muscle spindle remains capable of responding to stretch even the muscle is contracting. This is because of:
A. Reciprocal innervation
B. Presence of stretch receptors in the tendon
C. Co-activation of a- and ?-motor neurons
D. Autogenic inhibition
16. The smallest amount of muscle that can contract in response to excitation of a single motor neuron is:
A. The entire muscle
B. A muscle fasciculus
C. All muscle fibers supplied by that neuron
D. 1 muscle fiber
17. The hypertensive form of congenital adrenal hyperplasia is due to a deficiency of:
A. DHEA sulfokinase
B. 3ß-hydroxysteroid dehydrogenase
C. 11ß hydroxylase
D. 21 hydroxylase
18. An anterolateral cordotomy relieving pain in the right leg is effective because it interrupts the:
A. Right lateral spinothalamic tract
B. Left ventral spinothalamic tract
C. Left lateral spinothalamic tract
D. Left dorsal column
19. Saccades are programmed in the:
A. Frontal cortex
B. Medial longitudinal fasciculus
C. A and B
D. Superior colliculus
20. Which of the following characteristics is unique to skeletal muscle and is not observed in normal cardiac muscle?
A. Gradation of force production
C. Staircase phenomenon
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