The importance of the plateau phase of the action potential of myocardial cells is in
A) enhancing the efficiency of oxygen use by the cells.
B) preventing overstretching of the cells.
C) regulating Ca2+ availability to the cells.
D) preventing fibrillation.
E) preventing tetanus.
E) preventing tetanus.
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Arrange the five secondary vesicles in the correct anterior to posterior order
a: Diencephalon b: Myelencephalon c: Telencephalon d: Metencephalon e: Mesencephalon A. b, a, c, d, e B. a, b, c, d, e C. b, c, a, e, d D. c, d, e, a, b E. c, a, e, d, b
The medial concavity of the kidney is called the ________, which admits the renal nerves, blood vessels, lymphatic vessels, and ureter.
A. medulla B. cortex C. corpuscle D. hilum E. capsule
The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase
A. contraction B. relaxation C. latent or lag D. refractory E. threshold
Which statement represents the correct order of the reflex arc for micturition?
A. The reflex arc begins with stretch receptors in the urinary bladder's walls - parasympathetic neurons go from the spinal cord to the detrusor muscle - stretch receptors send signals to the sacral region of the spinal cord - the detrusor muscle contracts the internal urethral sphincter relaxes - urine is passed. B. The reflex arc begins with stretch receptors in the urinary bladder's walls - stretch receptors send signals to the sacral region of the spinal cord - the detrusor muscle contracts the internal urethral sphincter relaxes - parasympathetic neurons go from the spinal cord to the detrusor muscle - urine is passed. C. The reflex arc begins with stretch receptors in the urinary bladder's walls - stretch receptors send signals to the sacral region of the spinal cord - parasympathetic neurons go from the spinal cord to the detrusor muscle - the detrusor muscle contracts the internal urethral sphincter relaxes - urine is passed. D. The reflex arc begins with stretch receptors sending signals to the sacral region of the spinal cord - stretch receptors receive signals in the urinary bladder's walls - the detrusor muscle contracts the internal urethral sphincter relaxes - parasympathetic neurons go from the spinal cord to the detrusor muscle - urine is passed.