The small intestinal epithelium actively secretes digestive enzymes into the intestinal lumen
Indicate whether the statement is true or false
F
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B cells that differentiate during an initial immune response but remain dormant until being activated during a subsequent exposure to an antigen are called
A. monocytes. B. cytokines. C. macrophages. D. T cells. E. memory cells.
A group of cells with common properties that are organized into a layer or mass is a(n) ________.
Fill in the blank(s) with the appropriate word(s).
It is common to explain the relationships between the lung and surrounding structures by using the analogy of a fist inserted into a balloon. Accordingly, which of the following group of associations would be accurate?
A) fist—pleural cavity; space between inner and outer balloon layers—mediastinum; outer layer of balloon—endothoracic fascia B) fist—lung; space between inner and outer balloon layers—pleural cavity; outer layer of balloon—endothoracic fascia C) fist—lung; space between inner and outer balloon layers—pleural cavity; outer layer of balloon—parietal pleura D) fist—lung; space between inner and outer balloon layers—pleural cavity; outer layer of balloon—visceral pleura E) fist—pleural cavity; inner layer of balloon—visceral pleural; space between inner and outer balloon layers—endothoracic surgical plane
Rhythmicity of breathing involves
A. conscious effort and control. B. stimulation of inspiration. Expiration is automatic. C. pontine respiratory group as a necessary part. D. a set pattern of inspiration - expiration that is always the same. E. the pre-Bötzinger complex of the ventral respiratory group.