Which of the following is not a lymphatic organ? Select one:
a. liver
b. tonsils
c. spleen
d. appendix
a. liver
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Pulmonary surfactant
a. is secreted by Type II alveolar cells. b. decreases surface tension of the fluid lining the alveoli. c. resists elastic recoil of the lungs. d. is a combination of lipoproteins. e. all of these answers.
Which structure contains neurons?
A) G B) H C) B D) Y E) N
What is a major function of the endocrine system?
A) The endocrine system releases hormones into the bloodstream to reach receptors on target cells. B) The endocrine system communicates directly with target cells through the use of neurotransmitters. C) The endocrine system secretes products into ducts that lead to body surfaces or cavities. D) The endocrine system produces immediate, short-lasting effects.
The hematocrit is the percentage of the volume of a blood sample made up of
A. plasma. B. white blood cells. C. red blood cells. D. platelets.