Johnny fractured the lower third of his right tibia in a skiing accident. The soft tissues in the area were severely damaged and their surgical removal was necessary. After prolonged immobilization, it was found that Johnny was healing very poorly. The explanation offered by the orthopedic surgeon was that vascularization of the fracture site was still inadequate and good healing was absolutely
dependent upon an adequate blood supply. Describe how a long bone receives its blood supply and trace the path of nutrient delivery to the osteocytes.
What will be an ideal response?
Long bones are nourished by nutrient arteries that frequently enter the shaft. Removal of the soft tissues probably reduced the flow of blood to the affected area. The pathway would include diffusion of nutrients from blood vessels to periosteum to Volkmann's canals to Haversian canals to canaliculi to lacunae.
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Which of the following statements is true? Select one:
a. As thoracic volume increases, alveolar pressure (Palv) increases.
b. In expiration, the thoracic volume increases.
c. Constriction of bronchioles assists breathing.
d. As alveolar volume increases, alveolar pressure (Palv) decreases.
e. Pressure is directly proportional to volume.
The main component of the cytosol is ________
A) sugars B) water C) proteins D) salts
The most important function of the stomach is to begin protein digestion
Indicate whether the statement is true or false
In the statistical calculations for this experiment, the standard deviation in the fixed-interval reaction time experiment is usually lower than that of the random-interval reaction time experiment. What does this mean?
A. It means that there is more variability in the data for the fixed interval reaction time trials than in random-interval trials. B. It means that there is less variability in the data for the fixed interval reaction time trials than in random-interval trials. C. It means that average random-interval reaction times are typically longer than average fixed-interval reaction times. D. It means that average random-interval reaction times are typically shorter than average fixed-interval reaction times. E. It does not indicate any particular trend for fixed-interval vs. random-interval reaction time trials.