Blood leaves the right ventricle through which valve?
A. Pulmonary tricuspid
B. Tricuspid
C. Aortic semilunar
D. Bicuspid
E. Pulmonary semilunar
Answer: E
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Which of the following is a step within the common pathway of blood clotting?
A. Factor III combines with factor VII. B. Factor XII converts inactive factor XI to active factor XI. C. Prothrombin is activated to thrombin. D. Calcium combines with factor IX.
Several hormones act together to maintain pregnancy. They are:
a. Estrogen, prostaglandin, and relaxin b. Progesterone, prostaglandin, and oxytocin c. HnRH, LH, hCG, and progesterone d. Progesterone, prostaglandin, and relaxin
Two or more polypeptides chains combine to form a complex structure called a ________
A) primary structure B) beta-pleated sheet C) secondary structure D) tertiary structure E) quaternary structure
Sperm undergo a process of conditioning known as ________ after they arrive in the female reproductive tract.
Fill in the blank(s) with the appropriate word(s).