Which nerve arises from the brachial plexus?
A) Obturator nerve
B) Median nerve
C) Tibial nerve
D) Saphenous nerve
Answer: B
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In the salamander, the sour taste receptor cells function by having an apically localized K+ channel that is blocked by protons. When protons are applied, what happens to the membrane potential and why?
A) Receptor depolarization because K+ permeability, which normally maintains a hyperpolarized resting state is reduced. B) Receptor hyperpolarization because H+ ions move into the cell and render it more positively charged. C) Receptor hyperpolarization because the H+ ions outside the cell make the inside of the cell more negatively charged. D) Nothing will happen until the G-protein is activated.
The epidermis
A. is thicker than the dermis. B. is made up mostly of melanocytes. C. is composed of the reticular and papillary layers. D. is composed of loose connective tissue. E. contains no blood vessels.
Tetanus of a muscle is thought to be caused by
A. high calcium ion concentrations in the sarcoplasm. B. the rapid movement of sodium ions back into the sarcoplasmic reticulum. C. an increase in stimulus strength. D. increased temperature in the active muscle. E. decreased amounts of calcium ions in muscle tissue.
The I band is dark and split by a Z line.
Answer the following statement true (T) or false (F)