Which of the following is FALSE regarding single-unit smooth muscle cells?
A. They have many gap junctions between cells.
B. They may have pacemaker activity.
C. They have an individual neuron innervating each individual smooth-muscle cell.
D. They exhibit tone.
E. They may respond to stretch by contracting.
Answer: C
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Which of the below tissues provides the functions of the inner layer of the conducting organs?
a) stratified squamous epithelium with keratin b) ciliated pseudostratified columnar epithelium with goblet cells c) ciliated cuboidal epithelium with goblet cells d) transitional epithelium with cilia e) columnar connective tissue with goblet cells
An increase in the partial pressure of oxygen causes pulmonary arterioles to ________, thereby altering _______ to make gas exchange more efficient
A. constrict; perfusion B. dilate; perfusion C. constrict; ventilation D. dilate; ventilation
Without oxygen, brain damage will occur within _____.?
A) ?2 to 3 minutes B) ?4 to 8 minutes C) ?10 to 15 minutes D) ?25 to 30 minutes
Identify the organ system that bears the major responsibility for responsiveness, one of the necessary life functions, and briefly explain the system's role in the body
What will be an ideal response?