The primary function of a mature red blood cell is which of the following?
a. defense against toxins and pathogens
b. delivery of enzymes to target tissues
c. transport of respiratory gases
d. all of the listed responses are correct
Answer: c. transport of respiratory gases
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Graded potentials that increase the likelihood of an action potential bring the ________ closer to threshold.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. Lymph from about one fourth of the body drains into the right lymphatic duct. 2. The cisterna chyli is part of the right lymphatic duct that serves as a storage area for lymph. 3. Kupffer cells are specialized lymph capillaries in the walls of the small intestine. 4. Lymph nodes are capable of filtering bacteria from the lymph. 5. Lymph nodes typically have a single afferent vessel.
During a surgical procedure to excise a malignant thyroid gland, the surgeon asks you why she is not removing the posterior part of the patient's thyroid gland. Your correct response is:
A) so that the patient does not develop tetany. B) to avoid damage to the trachea . C) because it is only the posterior part of the gland that produces calcitonin. D) to avoid damage to the inferior laryngeal nerve. E) to avoid excessive bleeding.
The cerebellum communicates with other parts of the CNS by means of nerve tracts called the ________.
A. vermis B. flocculonodular pathways C. folia D. arbor vitae E. cerebellar peduncles