Blood entering a capillary bed is bright red, while blood leaving is a darker, bluish red. Why?
A. Wastes enter the bloodstream in the capillary.
B. Nutrients leave the bloodstream and enter the tissue fluid.
C. Blood with more oxygen is brighter red than deoxygenated blood.
D. Hemoglobin leaves the blood and enters the tissue fluid.
Answer: C
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Which of the following statements is not true?
A) Sympathetic origin is craniosacral; parasympathetic is thoracolumbar. B) Sympathetic ganglia are within a few centimeters of the CNS; parasympathetic are close to visceral organs served. C) Sympathetic division has short preganglionic and long postganglionic fibers; parasympathetic has long preganglionic and short postganglionic fibers. D) Sympathetic has extensive branching of preganglionic fibers; parasympathetic has minimal branching of preganglionic fibers.
White blood cells
a. are the most abundant type of blood cell. b. do not have nuclei. c. are actually only cell fragments. d. defend the body against foreign invasion. e. are found only in the blood.
The photoreceptor cells are located
A. on the surface of the retina. B. in the ganglionic layer of the retina. C. in the photoreceptive layer of the retina. D. in the choroid layer of the retina. E. in the pigment cell layer of the retina.
The putamen and globus pallidus are considered subdivisions of the
A) caudate nucleus. B) claustrum. C) lentiform nucleus. D) corpus striatum. E) limbic system.