Capillaries with an incomplete lining are called ________
a) incomplete capillaries
b) continuous capillaries
c) fenestrated capillaries
d) sinuses
e) vasa vasorum
Answer: c) fenestrated capillaries
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Why is there variation in skin color among modern humans?
A. People have different numbers of melanocytes. B. People have a different distribution of carotene in their skin. C. People have a different distribution of melanin in their epidermis. D. People are exposed to different chemicals over their lifetime. E. People have different hemoglobin in vessels close to their skin.
Because many of the same cardiac cells are innervated by both parasympathetic and sympathetic fibers, the influence of the two divisions on the heart is synergistic, meaning contraction is strongest when both divisions act together
Indicate whether the statement is true or false
Older red blood cells may be destroyed in the spleen
Indicate whether the statement is true or false
Which type of tissue covers the ends of long bones?
A. Periosteum B. Spongy bone C. Fibrocartilage D. Articular cartilage E. Elastic cartilage