What is the correct sequence of events along an axon that follows a membrane

reaching threshold potential?
1. The membrane depolarizes.
2. Sodium channels open and sodium ions diffuse inward.
3. The membrane repolarizes.
4.

Potassium channels open and potassium ions diffuse outward.
A) 1, 2, 4, 3 B) 4, 1, 3, 2 C) 3, 2, 4, 1 D) 2, 1, 4, 3


D

Anatomy & Physiology

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The flava ligament is

A) a paired ligament that connect the laminae of adjacent vertebrae. B) a fibrous band that connects the posterior surfaces of adjacent vertebral bodies. C) a band of fibrous tissue connecting the spinous processes of adjacent vertebrae. D) a longitudinal fibrous band that is attached to the tips of spinous processes from C7 to the sacrum. E) a wide fibrous band that connect the anterior surfaces of the adjacent vertebral bodies.

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The dura mater is the fragile, innermost meningeal layer that closely adheres to the surfaces of the brain and spinal cord

Indicate whether the statement is true or false

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_________ is caused by a transpulmonary pressure greater than zero.

A. A pneumothorax B. Inspiration C. Apnea D. Hyperpnea

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Which of the following does NOT aid in protection from friction and mechanical stress at a joint?

A. Menisci in the knee B. Ligaments C. Bursae D. Articular cartilage on bone surfaces

Anatomy & Physiology