Muscle fibers differ from "typical cells" in that muscle fibers
A) Lack a cell membrane.
B) Have many nuclei.
C) Are very small.
D) Lack mitochondria.
E) both B and C
B) Have many nuclei.
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Which feature(s) of the dermis ensure(s) that it remains interlocked with the epidermis?
A. Adipocytes B. Tension lines C. The collagen fibers in the reticular layer D. The dermal papillae E. The areolar connective tissue
"Chondrichthyes" means "cartilaginous fishes." Biologists used to assume that bone was not evolved until the Osteichthyes, or bony fishes
What clues do we have that shark ancestors, at some level, had bone? How can we infer this from (a) evidence from the fossil record and (b) evidence from comparative anatomy?
Cells that "eat" foreign material are called:
A) digesters B) macrocytes C) phagocytes D) morphocytes
The pathway of the sacral parasympathetic nerves
A) innervates the skin through the abdominal wall. B) joins the ventral roots of the spinal nerves. C) sends fibers directly and independently to the urogenital organs. D) forms distinct pelvic nerves that innervate intramural ganglia. E) None of the answers are correct.