The all-or-none principle states that
A) all stimuli will produce identical action potentials.
B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials.
C) the greater the magnitude of the stimuli, the greater the magnitude of the action potential.
D) only sensory stimuli can activate action potentials.
E) only motor stimuli can activate action potentials.
B
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The atria are separated from the ventricles externally by the
A. sinoventricular sulcus. B. anterior interventricular sulcus. C. posterior interventricular sulcus. D. coronary sulcus. E. None of the choices is correct.
Starting at the superior end of the spinal column, name the type of vertebrae in order.
A. Cervical, thoracic, lumbar B. Cervical vertebrae, thoracic vertebrae, lumbar vertebrae, sacrum, coccyx C. Cervical, lumbar, thoracic D. Thoracic, cervical, lumbar
The lens of the eye thickens when the
A. ciliary muscles relax. B. ciliary processes relax. C. ciliary muscles contract. D. suspensory ligaments pull on the lens capsule.
The gluteus maximus
A. does most of the work in "sit-ups." B. accounts for a sprinter's stance. C. allows one to sit cross-legged. D. is used in the knee-jerk reflex. E. is a common site for injections.