The minimum stimulus required to trigger an action potential is known as the
A) graded potential.
B) resting potential.
C) threshold.
D) refractory period.
E) membrane potential.
Answer: C
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The prolonged electrical depolarization of cardiac muscle cells that occurs during contraction is due primarily to the persistent influx of what ion?
A. Calcium B. Nitrate C. Potassium D. Chloride E. Sodium
Structure A is the
A) vertebral arch.
B) dens.
C) spinous process.
D) pedicle.
E) lamina.
Hypothyroidism may occur due to
a. anterior pituitary failure b. inadequate dietary supply of iodine c. failure of the thyroid gland itself d. both b and c e. all of the above
Lymphocytes don't stay in one lymphatic structure for long, which ensures better chances of meeting their antigen. This process of lymphocytes re-entering the blood and lymph to circulate every few days is called lymphocyte ________.
Fill in the blank(s) with the appropriate word(s).