What is the mechanism of marrow cavity enlargement in a long bone?
A) There is no mechanism; once formed, the marrow cavity does not change in size.
B) Blood vessels entering the marrow cavity enlarge it by eroding away the inner surface of
the bone.
C) The bone marrow cavity only increases in length, as the epiphyseal plates move apart.
D) As bone matrix is added to the external surface, osteoclasts remove matrix in the center of
the bone to enlarge the cavity.
E) None of the answers are correct.
D) As bone matrix is added to the external surface, osteoclasts remove matrix in the center of
the bone to enlarge the cavity.
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Merkel's disks are used by the visually impaired for reading Braille. One quality of the receptor that allows this is
A) A phasic firing. B) Small receptive field. C) A special sensitivity to deep pressure on the skin. D) A large dendritic tree.
Growth hormone stimulates all the cells in the body to increase the synthesis of ______________________________________
Fill in the blank(s) with correct word
What two methods do cells use to accomplish selective transport processes across membranes?
a. carrier-mediated transport and vesicular transport b. protein-assisted osmosis and vesicular transport c. phagocytosis and carrier-mediated transport d. protein-assisted transport and electrical diffusion e. phagocytosis and electrical diffusion
What is the function of the small intestine?
A. Absorbs nutrients B. Transports undigested food to the large intestine C. Digests food D. All apply.