COLUMN A 1. gametes
2. gonads
3. seminiferous tubules
4. puberty in males
5. testosterone
6. corpus luteum
7. puberty in females
8. atresia
9. human chorionic gonadotropin
10. oxytocin

COLUMN B
a. sperm production
b. endocrine structure
c. produces secondary sex characteristics
d. follicular degeneration
e, reproductive organs
f. indicates pregnancy
8. reproductive cells
h. milk ejection
i. menarche
j. spermatogenesis begins

1g

2e

3j

4a

5c

6b

7i

8d

9f

10h

Explanation:

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;