BioLab exam 2

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run2death
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187193
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BioLab exam 2
Updated:
2012-12-04 21:51:36
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BIOLAB
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  1. The function of the neuromuscular junction is to ________.
    convey an impulse from the nervous system to skeletal muscle
  2. This strong, cord-like structure attaches muscles to bones. 
    tendon
  3. A neuron and all the muscle fibers it stimulates is called a ________. 
    motor unit   
  4. The actual contractile units of muscles extend from Z disc to Z disc. They are ________. 
    sarcomeres
  5. Acetylcholine (Ach) is the neurotransmitter of axon terminals at the neuromuscular junction. It ________. 
    diffuses across the synaptic cleft, binds to receptors on the muscle membrane, and ultimately causes the muscle to depolarize and contract   
  6. The dark band of skeletal muscle results from the alignment of ________. 
    thick filaments
  7. This contractile protein forms the thin filaments. 
    actin
  8. Tendons differ from ligaments in that ________. 
    tendons bind muscle to bone and ligaments bind bone to bone   
  9. The space between the axon terminal and the sarcolemma of a muscle fiber is called the ________. 
    synaptic cleft   
  10. Sensory or afferent neurons are typically of this type. 
    unipolar
  11. Oligodendrocytes form myelin around ________. 
    several axons   
  12. Cerebrospinal fluid formed in the lateral ventricles travels through the ________ to reach the third ventricle. 
    interventricular foramen   
  13. The precentral gyrus ________. 
    is a major motor area of the brain   
  14. Somatosensory functions are carried out in this part of the spinal cord. 
    dorsal columns and horns   
  15. The lacrimal apparatus produces a watery solution known as ________. 
    tears
  16. Many older individuals develop presbyopia, a condition in which ________. 
    the near point of accommodation becomes further away   
  17. The ciliary body is a modified part of this tunic (layer) of the eyeball. 
    uvea
  18. A cataract is ________. 
    a change in the lens, rendering it hard and opaque   
  19. This structure, present in the cow eye but not in the human eye, is an iridescent, special reflecting surface that helps animals to see in low light conditions. 
    tapetum lucidum
  20. The inner layer of the retina ________. 
    is a transparent neural layer   

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