All epithelia are attached to the underlying tissue by a ________.
What will be an ideal response?
basal lamina
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The human immunodeficiency virus (HIV) targets mainly ________.
A. B cells B. helper T cells C. cytotoxic T cells D. plasma cells E. natural killer cells
Blood reaches the brain by two routes: through the ________ and the ________ arteries.
A) internal; external carotid B) internal carotid; vertebral C) external carotid; vertebral D) posterior; anterior cerebral E) anterior; posterior communicating
Which type of muscle tissue has cells that branch?
A. skeletal muscle B. smooth muscle C. cardiac muscle D. both skeletal and cardiac muscle E. both cardiac and smooth muscle
If a scientific opinion has been verified repeatedly, it becomes a
A) model. B) law. C) theory. D) variable. E) hypothesis.