Intact skin provides protection because
A. the skin enhances water loss from the body.
B. macrophages roam in the epidermis.
C. its secretions keep the skin slightly alkaline.
D. the skin contains components of the excretory system.
E. it forms a physical barrier against the entry of microbes.
E
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Environmental factors can cause __________, or a range of phenotypes from a single genotype
Fill in the blank with correct word
The brief period of time between the beginning of the action potential in the muscle and the beginning of contraction is referred to as the
A) repolarization period. B) latent period. C) relaxation phase. D) refractory period. E) depolarization period.
During appositional growth of cartilage, the cells that produce the matrix are the
A. fibroblasts. B. osteocytes. C. chondrocytes. D. chondroblasts. E. osteoblasts.
Of the three phases of swallowing, only the esophageal phase is involuntary.
Answer the following statement true (T) or false (F)