The spontaneous opening of Na+ channels marks the beginning of ________ of a cardiac muscle cell.

A. depolarization
B. repolarization
C. hyperpolarization
D. afterpolarization
E. isopolarization


Answer: A

Anatomy & Physiology

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Cerebrospinal fluid formed in the lateral ventricles travels through the ________ to reach the third ventricle.

A. median aperture B. central canal C. cerebral aqueduct D. interventricular foramen

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Which of the following is NOT true of colorblindness?

A. Protanopia involves a lack of or a decrease in sensitivity to the blue-sensitive cones. B. Deuteranopia involves a lack of or a decreased sensitivity to green-sensitive cones. C. Males and females can be colorblind, but the condition is more common in males. D. It is a hereditary trait carried on the X chromosome. E. All of these are true of colorblindness.

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Straightening the leg at the knee is an example of a type of movement called ________. 

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology

Which of the following waves of an ECG pattern is/are correctly described?

A. QRS complex-repolarization of ventricles B. T wave-depolarization of ventricles C. QRST complex-depolarization of ventricles D. P wave-depolarization of atria

Anatomy & Physiology