In a sarcomere, the central portion of thick filaments are linked laterally by proteins of the
A) Z line.
B) M line.
C) H band.
D) A band.
E) I band.
B
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When you are seated, which part of the hip bone bears your body's weight?
A) ischial spine B) ischial tuberosity C) acetabulum D) iliac tuberosity E) iliac fossa
An action potential in a neuronal membrane differs from a graded potential in that
A. movement of Na+ and K+ across cell membranes mediate action potentials, while graded potentials do not involve movement of Na+ and K+. B. an action potential is propagated without decrement, whereas a graded potential decrements with distance. C. an action potential has a threshold, whereas a graded potential is an all-or-none phenomenon. D. action potentials vary in size with the size of a stimulus, while graded potentials do not. E. an action potential requires the opening of Ca2+ channels, whereas a graded potential does not.
Which of the following is unique to neurons?
A) Mitochondrion B) Lysosome C) Golgi apparatus D) Chromatophilic substance
Which of the following is NOT a result of the secretion of estrogens and progesterone?
A. Uterine cycle B. Widening of the hips C. Growth of the vocal cords D. Growth of the uterus and breasts