Central chemoreceptors monitor:
A) blood pressure.
B) stretch in the walls of the trachea and bronchi.
C) partial pressure of oxygen (PO2 ) in the blood.
D) hydrogen ion concentration of cerebrospinal fluid (CSF).
Answer: D
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a. the brain b. the kidneys c. the small intestine d. the skin e. the heart
The pancreas has both endocrine and exocrine functions.
Answer the following statement true (T) or false (F)
Epithelium that consists of a single layer of cells, in which some cells are tall and thin and reach the free surface and others do not, is classified as
A) simple columnar epithelium. B) pseudostratified columnar epithelium. C) stratified squamous epithelium. D) transitional epithelium. E) simple squamous epithelium.
Which germ layer is tooth enamel derived from?
A. ectoderm B. mesoderm C. endoderm