Which is not involved in the process of bone repair following a fracture?
A. Fibroblasts produce collagen fibers to connect broken pieces of bone.
B. A fibrocartilaginous callus serves as a model for new bone growth.
C. Osteoclasts remove excess bone from the hard callus.
D. The fracture hematoma reorganizes to form a procallus.
E. No exceptions; all of the choices are involved in the process of bone repair.
E
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Local passive current flow decreases with distance because
a. ion pumps which drive current flow run out of energy (ATP) as they drift from the stimulus site. b. current leakage across the membrane attenuates current available for intracellular current flow. c. as it gets away from the active zone, the membrane fluidity decreases and prevents influx of booster current. d. of all of these reasons. e. of none of these reasons.
Which of the following best differentiates between the endoneurium and myelin?
A. Endoneurium is more complex because it is composed of connective tissue; whereas myelin is composed of individual cells. B. Myelin is composed of epithelial tissue, while endoneurium is composed of connective tissue. C. Myelin and endoneurium are essentially the same thing, a connective tissue covering surrounding axons of neurons. D. Myelin is more complex as it is composed of multiple cells surrounding a neuron; whereas the endoneurium is simply connective tissue.
The upper part of the sternum is called the:
a. costal cartilage b. xiphoid process c. body d. manubrium
The proliferative phase of the uterus is driven by estrogen from the ovaries
Indicate whether the statement is true or false