What step occurs first in the embryonic development of most bones?
a. Appositional growth occurs.
b. A bony collar forms.
c. The medullary cavity is formed.
d. Cartilage is digested away.
Answer: b. A bony collar forms.
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Which of the following statements accurately describes electrons?
A. They are found inside the nucleus and have a positive charge. ?B. They are in orbitals outside the nucleus and have a positive charge. ?C. They are found inside the nucleus and have a negative charge. ?D. They are in orbitals outside the nucleus and have a negative charge.
The major histocompatibility complex (MHC)
A) kills the target cell by disrupting its metabolism. B) produces antibodies in lymph glands. C) is a group of genes that codes for CD4 markers. D) is a membrane protein that can display foreign antigens. E) is the antigen found on bacteria that stimulates an immune response.
Distinguish among efferent vessels, afferent vessels, and exchange vessels
A) Efferent vessels exchange nutrients, dissolved gases, and wastes between the blood and interstitial fluid, afferent vessels carry blood away from the heart, and exchange vessels carry blood to the heart. B) Efferent vessels exchange nutrients, dissolved gases, and wastes between the blood and interstitial fluid, afferent vessels carry blood to the heart, and exchange vessels carry blood away from the heart. C) Efferent vessels carry blood to the heart, afferent vessels carry blood away from the heart, and exchange vessels exchange nutrients, dissolved gases, and wastes between the blood and interstitial fluid. D) Efferent vessels carry blood away from the heart, afferent vessels carry blood to the heart, and exchange vessels exchange nutrients, dissolved gases, and wastes between the blood and interstitial fluid. E) Efferent vessels carry blood to the heart, afferent vessels exchange nutrients, dissolved gases, and wastes between the blood and interstitial fluid, and exchange vessels carry blood away from the heart.
Extensibility refers to the ability of a muscle to stretch.
Answer the following statement true (T) or false (F)