Which of the following is not true of the respiratory tract from the medium bronchi to the aveoli?
A) Cartilage gradually decreases and disappears at the bronchioles.
B) Resistance to air flow increases due to the increase in cross-sectional diameter.
C) Proportionally, smooth muscle decreases uniformly.
D) Lining of the tubes changes from ciliated columnar to simple squamous epithelium in the alveoli.
B) Resistance to air flow increases due to the increase in cross-sectional diameter.
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True or False? A mutation that alters collagen production could render the dermis less effective at maintaining the strength of the skin.
Answer the following statement true (T) or false (F)
The parasympathetic division uses only ________ as a neurotransmitter in the ganglionic neurons.
Fill in the blank(s) with the appropriate word(s).
The olfactory epithelium responsible for the sense of smell is located in the
A. floor of the nasal cavity. B. wall of the nasal septum. C. lining of the nasopharynx. D. cavity of the paranasal sinuses. E. roof of the nasal cavity.
Paramesonephric ducts degenerate when the hormone ________ is present
A. inhibin B. estrogen C. testosterone D. AMH E. TSH