What is true about the urethral sphincters?
A) Both sphincters are under voluntary control.
B) The internal urethral sphincter is made up of skeletal muscle.
C) The internal urethral sphincter is under involuntary control.
D) The external urethral sphincter is under involuntary control.
Answer: C
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A major difference between oogenesis and spermatogenesis is that each cycle of oogenesis results in
A. three viable polar bodies, whereas a single cycle of spermatogenesis produces no polar bodies. B. a tiny viable egg, whereas a single cycle of spermatogenesis produces four sperm, each much larger than the egg. C. four viable eggs, whereas a single cycle of spermatogenesis produces only one sperm. D. only one viable egg, whereas a single cycle of spermatogenesis produces four spermatozoa. E. three viable eggs, whereas a single cycle of spermatogenesis produces only one sperm.
The merocrine, apocrine, and holocrine secretions differ in the
A. amount of cytoplasm secreted along with the glandular product. B. number of cells that secrete. C. amount of glycoprotein secreted with the glandular product. D. locations of the glands that produce them.
What type of tissue occurs at #1?
A) elastic tissue B) fibrocartilage C) bone D) hyaline cartilage E) marrow tissue
Which type of membrane proteins allow cells to identify one another?
A. Receptor proteins B. Channel protein C. Marker molecules D. Carrier proteins E. Enzymes