The ductus arteriosus allows fetal blood to move from the
A) right atrium into the left atrium. B) pulmonary trunk into the aorta.
C) aorta into the pulmonary trunk. D) left atrium into the right atrium.
B
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What factors determine the maximum frequency of action potentials conducted by an axon?
What will be an ideal response?
Deep means
A. away from the surface. B. closer than another structure to the point of attachment to the trunk. C. closer to the head. D. toward the middle or midline of the body. E. toward the back of the body.
Which of the following is true about threshold for an action potential?
A) It is more positive than the resting membrane potential. B) Voltage-gated potassium channels begin to close. C) Voltage-gated potassium channels begin to open. D) The membrane begins to hyperpolarize. E) Threshold for a typical neuron is approximately -30 mV.
Some of the largest spherical cells in the human body (for example, oocytes) have a diameter of approximately
A. 1 nm. B. 1 cm. C. 1 mm. D. 100 nm. E. 100 mm.