Na+ is best known as a(n):
A) macromolecule. B) ion. C) molecule. D) compound.
Answer: B
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As sperm travel from their site of production in the testes to the exterior, the sequence of ducts through which they will pass is:
A. rete testis; efferent ductules; vas deferens; ejaculatory duct; urethra. B. efferent ductules; rete testis; vas deferens; ejaculatory duct; urethra. C. rete testis; efferent ductules; vas deferens; urethra; ejaculatory duct. D. rete testis; afferent ductules; ejaculatory duct; vas deferens; urethra. E. rete testis; ejaculatory duct; efferent ductules; vas deferens; urethra.
One effect of aging on the skeletal system is
A. decreased collagen fibers. B. Decreased bone matrix and decreased collagen fibers are effects of aging. C. decreased bone matrix. D. increased bone density. E. increased elastic fibers.
Typical movement at a hinge joint includes
A) gliding. B) extension. C) rotation. D) flexion. E) both extension and flexion.
By weight, which element is the most plentiful in the human body?
A) sulfur B) sodium C) oxygen D) potassium E) carbon