The scrotum of the male and labia majora of the female are said to be homologous structures because they both develop from the ____ _____ of the embryo.
A) genital tubercle
B) urogenital sinus
C) urethral folds
D) labioscrotal swellings
Answer: D) labioscrotal swellings
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During a hyperpolarizing graded potential, positively charged ions flow away from the site of the initial hyperpolarization on the outside of membrane and toward this site on the inside.
Answer the following statement true (T) or false (F)
A woman undergoes coronary bypass surgery, in which a blood vessel from her leg is moved to her heart, where it supplements the blood supply following a heart attack. This procedure is a(n)
A. allograft. B. isograft. C. xenograft. D. autograft.
Answer the following statements true (T) or false (F)
1. By about day 35 of gestation, the heart is beating. 2. By the eighth week of gestation, all organ systems are complete and in place. 3. The lining of the lungs and the lining of the gastrointestinal tract develop from the mesoderm. 4. The brain and spinal cord develop from the ectoderm. 5. The dermis of the skin and the circulatory system develop from the mesoderm.
The most common type of blood in the U.S. population is ________
A) A B) B C) AB D) O E) AO