Gray hair is
A) a mixture of red and brown hairs.
B) a mixture of pigmented and unpigmented hairs.
C) caused by a pigment, pseudomelanin.
D) a form of albinism.
B
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Breathing is an example of ________ reflexes
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. The second greatest source of water for the body is the water produced by the catabolism of food. 2. Potassium is the most common cation in intracellular fluid. 3. With slight variation, the amount of extracellular fluid equals the amount of intracellular fluid. 4. One reason the amount of water per pound increases in the elderly is that the muscle mass decreases and body fat increases.
The figure illustrates a medial view of bones of the right foot. What does "E" represent?
A. calcaneus B. fibula C. metatarsals D. tibia E. talus
Which of the following is not a mechanism that aids in the venous return of blood to the heart?
A. Pressure gradient B. Smooth muscle pump C. Gravity D. Cardiac suction