The reason for the reddish tint seen in lightly pigmented skin is the molecule formed by the combination of oxygen and melanin.
Answer the following statement true (T) or false (F)
False
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Which of the following statements about the refractory period of neuronal or muscle membranes is TRUE?
A. In nerve cells, the absolute refractory period coincides with the period of increased K+ permeability. B. In skeletal muscle cells, the absolute refractory period lasts about as long as the twitch. C. The relative refractory period in neuronal membranes lasts about the same length of time as the absolute refractory period in cardiac muscle cell membranes. D. The refractory period in an alpha-motor neuron membrane is much briefer than the refractory period in a skeletal muscle cell membrane. E. In ventricular cells, the absolute refractory period coincides with the period of increased Na+ and Ca2+ permeability.
From the stomach, food passes into the duodenum, then the jejunum, and then the ileum.
Answer the following statement true (T) or false (F)
The female structure that corresponds to the male penis is the
A) labia minora. B) clitoris. C) vagina. D) vestibule.
The pyramids are located in the:
a. pons b. medulla c. spinal cord d. cerebellum