Which of the following contains overlapping thick and thin filaments?
A. Z discs
B. H band
C. I band
D. A band
E. M line
Answer: D
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A lack of lung surfactant causes ________ lungs that resist expansion.
A. floppy B. inflamed C. infected D. stiff
Tetanic muscle contractions don't occur in a normal cardiac muscle because
A) cardiac muscle tissue contracts on its own. B) neural stimulation is lacking. C) the refractory period lasts until the muscle relaxes. D) the refractory period ends before the muscle reaches peak tension. E) potassium channels outnumber sodium channels.
The most complex respiratory system among vertebrates is found in
a. mammals. b. reptiles. c. birds. d. amphibians. e. fish.
In ________, carrier molecules move a substance against (up) its concentration gradient.
A. simple diffusion B. endocytosis C. exocytosis D. facilitated diffusion E. active transport