The hardest substance found in a tooth is
A) enamel
B) dentin
C) gingiva
D) pulp
Answer: A) enamel
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The fertilized ovum is also called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
The nervous system reacts to stimuli ________ compared to the endocrine system, adapts ________ compared to the endocrine system, and has ________ effects compared to the endocrine system.
A. quickly; quickly; specific B. slowly; slowly; widespread C. quickly; slowly; specific D. slowly; quickly; specific E. quickly; quickly; widespread
A male is considered to be sterile if he produces less than how many spermatozoa in one ml of seminal fluid??
A) ?20 million B) ?50 million C) ?100 million D) ?150 million
Which of the following statements about hormones is correct?
A. Anterior pituitary hormones are synthesized in the hypothalamus. B. All hormones secreted by the anterior and posterior pituitary glands are peptides. C. IGF-1 stimulates growth by increasing growth hormone secretion through positive feedback. D. All of the hypophysiotropic hormones are peptides. E. Only steroid hormones can regulate the secretion of steroid hormones.