Most inspired particles such as dust fail to reach the lungs because of the ________.
A) ciliated mucous lining in the nose
B) abundant blood supply to nasal mucosa
C) porous structure of turbinate bones
D) action of the epiglottis
A) ciliated mucous lining in the nose
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Photopigments undergo chemical changes when light hits them.
Answer the following statement true (T) or false (F)
Which of the following directly regulates the secretion of insulin?
A) parasympathetic nervous system B) sympathetic nervous system C) blood glucose concentration D) hypothalamus E) tropic hormones from the pituitary gland
The inferior end of the esophagus normally remains in a state of active contraction that __________.
a. prevents the back flow of materials from the stomach into the esophagus b. prevents air from entering into the esophagus c. allows food to move rapidly into the stomach d. initiates the movement of food from the stomach into the small intestine
Which of the following is not part of the choroid layer?
a. iris b. cornea c. ciliary muscle d. all of the above are part of the choroid layer