Caffeine and related stimulants exert their effects by
A) inhibiting a specific neuromodulator.
B) inhibiting a specific neurotransmitter.
C) mimicking a specific neuromodulator.
D) mimicking a specific neurotransmitter.
A) inhibiting a specific neuromodulator.
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Which is not correct regarding the white pulp of the spleen?
A. Its cells include T-lymphocytes, B-lymphocytes, and macrophages. B. Its cells are arranged in clusters that are circular in shape. C. It contains a central artery. D. It serves as a blood reservoir.
Platelets are small cell fragments shed from the outer edges of extraordinarily large bone marrow–bound cells known as __________
Fill in the blank(s) with correct word
Which of the following statements concerning the pancreas is true?
A. Most of the hormones produced by the pancreas flow into the pancreatic duct. B. Both glucagon and insulin are produced in the islets of Langerhans. C. The pancreas is located above the liver. D. The endocrine portion of the gland is called the zona reticularis. E. Alpha and beta cells are associated with the acini.
Which of the following statements concerning blood vessel walls is true?
A. The tunica adventitia is composed of smooth muscle and endothelium. B. Capillaries have both a tunica intima and a tunica media. C. The tunica intima is the innermost layer of a blood vessel wall. D. The tunica media is found in all blood vessels except veins. E. Vessel diameter is controlled primarily by the tunica intima.