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

Anatomy & Physiology

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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.

Anatomy & Physiology

Which of the following is unique to neurons?

A) Mitochondrion B) Lysosome C) Golgi apparatus D) Chromatophilic substance

Anatomy & Physiology

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

Anatomy & Physiology

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

Anatomy & Physiology