Antigens are
A. something made by a white blood cell to destroy a pathogen.
B. disorders involving overactive immune systems.
C. membrane receptors on B-lymphocytes.
D. something that an antibody or T-lymphocyte binds to.
Answer: D
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Vagal tone refers to the
A. decreasing of the heart rate below its inherent rhythm by parasympathetic stimulation. B. decreasing of the heart rate below its inherent rhythm by sympathetic stimulation. C. increasing of the heart rate above its inherent rhythm by sympathetic stimulation. D. increasing of the heart rate above its inherent rhythm by parasympathetic stimulation.
The receptors that are found on all autonomic ganglionic neurons as well as at the neuromuscular synapse of the SNS are
A) muscarinic receptors. B) nicotinic receptors. C) delta receptors. D) beta receptors. E) alpha receptors.
The various types of epithelium are classified by
A. the number of cell layers and size of the cells. B. function and size of cells. C. the size and location of cells. D. the shape of cells and number of cell layers. E. the size and shape of cells.
Identify the function of withdrawal reflexes.
a. Maintain constant length and tension of a muscle and thus maintain posture b. Protect muscles and tendons from damages caused by excessive tension c. Removes a body part from a painful stimulus