The first line of cellular defense against pathogens are the
A) T cells.
B) B cells.
C) NK cells.
D) phagocytes.
E) plasma cells.
Answer: D
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The ________ is a large, flat, diamond-shaped muscle that extends from the skull and vertebral column to the pectoral girdle laterally. It depresses, retracts, or rotates the scapula.
A. levator scapulae B. subclavius C. serratus anterior D. trapezius E. pectoralis minor
Meiosis is a type of cell division unique to gametes, that serves to produce haploid sperm and egg cells.
Answer the following statement true (T) or false (F)
Vasectomy results in sterility because it inhibits sperm production
Indicate whether the statement is true or false.
The embryonic heart
A. develops from two endothelial tubes that fuse together. B. consists of four chambers. C. has two atria but only one ventricle. D. doesn't beat until just prior to birth. E. has no passages connecting right side to left side.