The cross-sectional view of the spinal cord reveals white matter on the
A. inside, gray matter on the outside, and a dorsal sensory root.
B. outside, gray matter on the inside, and a ventral sensory root.
C. inside, gray matter on the outside, and a dorsal motor root.
D. outside, gray matter on the inside, and a ventral motor root.
Answer: D
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Chemical substances secreted by cells into the extracellular fluids and that regulate the metabolic function of other cells in the body are called ________.
A) enzymes B) antibodies C) proteins D) hormones
Which of the following is correct?
a. Exocytosis decreases the surface area of the plasma membrane. b. Endocytosis can help remove cytoplasmic debris from inside the cell. c. Exocytosis is triggered by the binding of a particle in the ECF to a receptor site on the plasma membrane. d. Exocytosis involves passive movement of material out of the cell. e. None of these.
The iris of the eye contains
A. skeletal muscle. B. multiunit smooth muscle. C. single-unit smooth muscle. D. cardiac muscle.