A motor neuron typically receives input from neurons that originate in various areas of the brain. This type of circuit is a
A) divergent circuit.
B) convergent circuit.
C) serial processing circuit.
D) parallel processing circuit.
E) reverberating circuit.
B
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In the peripheral nervous system, Schwann cells participate in the repair of damaged nerves by
A) producing new axons. B) regenerating cell bodies for the neurons. C) forming a cellular cord that directs axonal regrowth. D) clearing away cellular debris. E) producing more satellite cells that fuse to form new axons.
Which of the following is true in reference to what may pass through the placental barriers?
A) hormones, blood cells, and nutrients B) nutrients and respiratory gases only C) respiratory gases, hormones, nutrients, and blood cells D) nutrients, respiratory gases, wastes, and alcohol
The formation of HCl in the stomach involves the
A. active transport of H+ from parietal cells into the lumen of the stomach. B. exchange of Na+ for H+ in the transport process. C. exchange of Na+ and bicarbonate ions. D. active transport of Cl? from parietal cells into the lumen of the stomach. E. the combination of CO2 and water.
Which of the following is an example of incomplete dominance?
A. minor thalassemia B. major thalassemia C. beta thalassemia D. polymorphism E. ABO blood groups