All connective tissues have three features in common. They are
A. cells, hormones, and protein fibers.
B. cells, protein fibers, and ground substance.
C. protein fibers, a liquid portion, and ground substance.
D. cells, a liquid portion, and protein fibers.
E. cells, protein fibers, and mucus.
Answer: B
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Which class of chemical messenger facilitates white blood cell formation in bone marrow?
A. Interleukins B. Colony-stimulating factors C. Tumor necrosis factors D. Interferons
In a normal ECG tracing, the T wave represents the:
a. repolarization of the atria b. depolarization of the atria c. repolarization of the ventricles d. depolarization of the ventricles
Identify the FALSE statement.
A) Some reflexes are genetically determined. B) Adipose tissue is controlled by autonomic efferents. C) Muscle spindles are stretch receptors. D) Proprioceptors detect limb position and movement. E) All reflexes require input from the brain.
Facial muscles are unusual in that they
A. represent a combination of first-class and second-class lever systems. B. insert and sometimes originate on skin and connective tissue. C. are smooth muscles rather than skeletal muscles. D. are not involved in movement. E. are not involved in facial expression.